THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 17/18, 2025.........BOING!!
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 17/18, 2025.........BOING!!
I don't know what it is called, you're right the 99 doesn't have a cocking shoe, it is the flat spring that bears on the cocking lever in the manner of a cam-chain adjuster shoe.
Got it scoped with a vintage Tasco 3-7x32, just sorting out a pellet selection for testing. Taking the Mercury as well, cleaned the barrel and fitted with a similar scope of known performance. Can imagine which one is going to do better ... even taking some original vintage Eley Wasp .177s to see how the BSA does with its intended diet ...
I've never fixed a porous part, but when I was casting detailed urethane parts in silicone moulds I learned something that might help someone. I have both a vacuum chamber and a pressure pot, the vacuum is used for degassing resins as well as creating a vacuum to draw resin in, it's a good solution but not everyone has access to a high vacuum pump or suitable container. A pressure pot is much easier to find and compressors are common. You'd think that the pressure pot would be inferior because there will always be a bubble of air trapped in the part. Not always so, when you get to 50 or so PSI the bubble of air will actually dissolve into some resins, leaving no bubble behind. It definitely works with urethane resins that I use, producing flawless castings.
So, it's possible you can completely seal a porous part without a vacuum system.
Hi Al. A bit of both.......I blocked the TP. Ran some thread lock in. Then squeezed it in, using the piston with its old seal. I then found a suitable small piece of wood which, when fitted behind the piston, was long enough to sustain some pressure with the end block screwed in. Left for a few hours. Removed piston. Left the cylinder for a day then cleaned the end with wide dowel with some wet and dry on the end.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 17/18, 2025.........BOING!!
Ah yes cocking link tensioner. Like a cam-chain tensioner but smaller than the one on a 400/4. The Mercury did actually like the Wasps.
After the somewhat frustrating session with the Mercury I returned from the dentists to try the 99K.
Oh dear, not good even at 10 yards. So I thought, maybe it is the scope? Swapped it with the one on the Mercury. Same deal. Tried it at greater range in case I was just not making an effort.
At 30 yards the groups were 3" even though I could see the crosshairs were not moving perceptibly. Is it this short barrel, not having a choke might do that? But Paul would have said if it was super fussy about pellets when he sold it to me, he's a true BBS gentleman.
I noticed the gap between the thud of the rifle and the 'snaK!' of the impact had a pistol-like length to it. Looking at the target the pellets were only slightly squished.
Hm. Power issue. Spring is nice and strong, cocking with the short barrel emphasised that.
I performed the 'digital compression test'. Absolutely no vacuum and no pressure build through that TP. Gun must have been making 4 fpe with whatever air couldn't escape fast enough past the piston washer.
At the rebuild yesterday when I swapped the pistons I did notice there was a nick in the old piston washer, but I couldn't find any sharp edges. Maybe I missed one. It was quite a small nick so I am not sure whether that would cause the catestrophic loss of compression. I also used very dry molygrease, like I blended some moly powder with some grease to make a paste, could this have resulted in a lack of sealing? Not sure.
What I suspect is that the supplier of the glided piston has put a 25mm piston head on the piston instead of the 26mm, but I did not notice because the Air Arms style bearings give a bit of cushioning when sliding the piston in.
It's too late to strip it down tonight but I think that is the problem. I've got a 26 mm seal somewhere from an HW85 so hopefully that will solve this mystery.
Springers eh? Nuffink is simple ....
Last edited by Hsing-ee; 18-03-2024 at 09:10 PM.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- May 17/18, 2025.........BOING!!
The 25mm seals are a different design to the 26's so should be able to tell by looking at them. Regards Max
Plinkerer and Tinkerer