Help / Advice with Theoben Fenman .22

[Eyefor]

As above.

After quite an exhaustive search I recently purchased the Fenman and have been disappointed with it's accuracy which I blamed on the trigger, which I estimate to be a good 4 - 5lb pull at the second stage.

After checking websites and trawling YouTube, I found that the trigger can be adjusted using the grub screw which sits inside the slotted screw - but, my Fenman does not have the outer slotted screw, only the grub screw.

Few questions please -

1. Is there a model not having the two screw adjustment?

2. If the outer screw should be present, then the grub screw in my Fenman is using the threads intended for the slotted screw?

3. If it should have the two screw set up, where can I buy one from please?

Thanks in advance

[robs5230]

As above.

After quite an exhaustive search I recently purchased the Fenman and have been disappointed with it's accuracy which I blamed on the trigger, which I estimate to be a good 4 - 5lb pull at the second stage.

After checking websites and trawling YouTube, I found that the trigger can be adjusted using the grub screw which sits inside the slotted screw - but, my Fenman does not have the outer slotted screw, only the grub screw.

Few questions please -

1. Is there a model not having the two screw adjustment?

2. If the outer screw should be present, then the grub screw in my Fenman is using the threads intended for the slotted screw?

3. If it should have the two screw set up, where can I buy one from please?

Thanks in advance

All the Theoben break barrel rifles, were fitted with the Evolution trigger from 1994 onwards
You should be able to get a date on yours (approx) from the serial number database. Message "The Squire" on here who should be able to help you date it.

Parts wise, I think the only source, outside collectors / hoarders, of Theoben parts, would be Impact Airguns / Selective Arms, who took over the remnants of Theoben's business

[maximus]

All the Theoben break barrel rifles, were fitted with the Evolution trigger from 1994 onwards
You should be able to get a date on yours (approx) from the serial number database. Message "The Squire" on here who should be able to help you date it.

Parts wise, I think the only source, outside collectors / hoarders, of Theoben parts, would be Impact Airguns / Selective Arms, who took over the remnants of Theoben's business

I don't quite understand your description of the adjustment screw. I don't believe there is a slotted screw on a theoben break barrel. There is a grub screw with a 5mm or so hex then inside that which you won't see easily is a much smaller hex screw that can be altered to increase or reduce the spring pressure against a small ball bearing held in the end of the larger grub screw. Turning the larger screw alters the crispness of the second stage.

[robs5230]

I don't quite understand your description of the adjustment screw. I don't believe there is a slotted screw on a theoben break barrel. There is a grub screw with a 5mm or so hex then inside that which you won't see easily is a much smaller hex screw that can be altered to increase or reduce the spring pressure against a small ball bearing held in the end of the larger grub screw. Turning the larger screw alters the crispness of the second stage.

From what I make of the OP's description, is that someone has replaced the outer screw, and the inner screw is no longer present

[maximus]

From what I make of the OP's description, is that someone has replaced the outer screw, and the inner screw is no longer present

Best thing to do would be to unscrew the adjustment screw completely and see what he has. Should be an my or m6 grub screw with a sprung loaded bb sticking out of the end. Regards Max

[Eyefor]

Thanks for all the replies.

Photo of a friends Fenman which shows the correct outer slotted screw with inner grub screw.

[IMG][/IMG]


Below is from the Theoben Gas Ram manual

Quote

All break action rifles from October 1994 are fitted with the Evolution Trigger mechanism. Designed by Theoben, based on a falling block system. This is a 2-stage unit with automatic safety. The second stage is adjustable for weight and travel. Note: The automatic safety catch fitted from 1986 onwards.

Forward of the trigger pull is a slotted screw adjustment. This screw moves the second stage position. Turn clockwise to increase engagement and anticlockwise to decrease. Move this adjustment 1⁄4 turn at a time only. If turned too far clockwise this will block trigger until adjusted back anticlockwise. Second stage trigger pressure (weight) is adjusted by the allen grub screw found INSIDE the slotted screw, clockwise = heavier, anticlockwise = lighter again if this screw is turned in too far clockwise the trigger will be blocked until it is backed off.

Unquote

Later today I will also have a photo of my gun showing the single screw.

[The Squire]

If the internal grubscrew is missing then the trigger does become very heavy. If it’s the same as an Evolution then it’s an M4 and you’ll need a small compression spring in there too.

[maximus]

All my theobens are later models and have a hex screw rather than the slotted screw to adjust the second stage. I guess my sirocco 2000 is the oldest but this also has the hex screw. Basically all the screw needs is the middle adjusting to give so reasonable resistance then screw the whole assembly in until the point the the trigger breaks just coincides with the point which the trigger blade contacts with the bb on the end of the adjustment screw.

[Eyefor]

All my theobens are later models and have a hex screw rather than the slotted screw to adjust the second stage. I guess my sirocco 2000 is the oldest but this also has the hex screw. Basically all the screw needs is the middle adjusting to give so reasonable resistance then screw the whole assembly in until the point the the trigger breaks just coincides with the point which the trigger blade contacts with the bb on the end of the adjustment screw.

This is exactly what I have found. Picture below

[IMG][/IMG]

I was off on a tangent because of the slotted screw in my friends Fenman and the (online) Theoben manual advising to adjust the slotted screw - plus there was some crud on the inner screw which hid the inner hex.

All sorted now.

Also, with thanks to Dave / The Squire (reply above), mine is June 1999 - also a later model.

Many thanks for all replies.

AirgunBBS to the rescue (once again!).

[maximus]

Glad its sorted pal. The triggers aren't fantastic but can be set up to give a really crisp release if not the lightest first stage, second can break like glass.

[Eyefor]

Glad its sorted pal. The triggers aren't fantastic but can be set up to give a really crisp release if not the lightest first stage, second can break like glass.

If I can get it like my friends Fenman (the one with the slotted screw) then that will do me. I'm spoilt by have two Daystate's (both MkIV IS, one .177 sub 12 and the other .22 fac) so, after playing around with the Fenman, when I fired the .177 at a squirrel yesterday I nearly pulled the damn trigger off.

Idiot!!

Thanks again for your help.