I get by with a little help from my friends
My Gamo Centre was woefully under powered & when I stripped it down I found the reason why, a knackered piston seal. I've received a replacement but it's a different type & seems to be too small to fit the piston. Is there a trick to fitting these? The new seal is a rigid material whereas the original is a flexible material. Hope the pics help.
UBC Resident Cowboy
St Paul of 55
Been there, bought it, tried it, sold it
Registered User
Hi,
I replaced one of these recently and also found it a crazily tight fit onto the piston.
I got it on in the end, I vaguely remember possibly opening the hole on the seal with a bit of sandpaper so it could fit over the plug on the end of the piston.
A real struggle to get it on but it fit inside the cylinder well and the pistol now shoots really nicely.
Matt.
Award-winning Airgun Anorak
In the past I found that when fitting tight piston seals it helped to dunk them in very hot water for a while first to soften them, then force them down a bar slightly larger than the bit on the piston you want to stretch it onto.
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B
In British slang an anorak is a person who has a very strong interest in niche subjects.
I get by with a little help from my friends
Cheers guys, I'm off to boil the kettle, lol
UBC Resident Cowboy
St Paul of 55
Been there, bought it, tried it, sold it
Registered User
I made up a set of taper sliders for different diameter seals. Just slide them down.Originally Posted by Paul55
Baz
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BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD
Registered User
That’s geniusI made up a set of taper sliders for different diameter seals. Just slide them down.
Baz
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[IMG]
Registered User
that's a CV gaiter / boot fitting tool, scaled down
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
I get by with a little help from my friends
Boy, I could do with a set of those. The seal's been taking a hot bath for quite a while but it's still bloody stiff
UBC Resident Cowboy
St Paul of 55
Been there, bought it, tried it, sold it
I get by with a little help from my friends
Got the little bugger on, new breech seals & the O ring in the transfer port fitted too. ResultMuch smoother cocking & a respectable 2.61 ft/lb.
Thanks guys, got there in the end.
UBC Resident Cowboy
St Paul of 55
Been there, bought it, tried it, sold it
Mushroom Man
A bit late now .... I had a similar problem but can't remember the rifle. New seal was very tight and even after hot water I could not get it over the piston end without expecting serious damage / pain to me fingers and thumbs. In the end I used a large woodworking vice as a press ... rigged up suitable bits and pieces to avoid pressure on the piston rod, just on piston body, and it worked like a dream. Just went slowly ...
Those fitment things above look good.
Cheers, Phil
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