1933 Breakdown Pattern  

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Whitworth
(@whitworth)
Member Registered

Hi all, seeing the last post here prompted me to put up some photos of my breakdown pattern, although I'm slightly embarrassed to do so!

I got hold of this in very poor condition, it had a bent barrel which I straightened over the edge of the bench until the reflections down the barrel became concentric. It now shoots incredibly accurately. I made and fitted a new washer and barrel seal and have enjoyed noticing the power return with use. The washer retaining screw was badly damaged and had to be replaced. The fore sight had been filed down to almost nothing so I build it back up with weld and filing, the rearsight blade and thumbwheel had been replaced with a solid piece of brass with a slot cut in it so I purhased a new blade and wheel.

I'm sure I read somewhere many of these were used in fairgrounds with cork firing attachments, I wonder if by the rough handling and sight modifications this was one of them?

I don't mind that it is very tatty and slightly cobbled together, it is a joy to use and I have been doing some very close range ratting with it.




It is however still very noisy- the inside of the piston is somehow very deeply grooved from the spring rubbing against it. The spring rubs against these grooves (they run around the inside of the piston, not along it as one would expect) wasting power and feeling jarring. I cannot find much information about the breakdown pattern online, could anyone tell me if a piston and spring from a more common model would fit? It is my only air rifle at present so I have nothing to compare it to.

I'd love a pre war .22 underlever next, anyone got an extremely tatty one otherwise destined for spares I could put back in use?

Best wishes, Chris.

Quote
Posted : 09/07/2019 5:02 pm
Garvin
(@garvin)
Curator in Chief Admin
Posted by: Whitworth

Hi all, seeing the last post here prompted me to put up some photos of my breakdown pattern, although I'm slightly embarrassed to do so!

I got hold of this in very poor condition, it had a bent barrel which I straightened over the edge of the bench until the reflections down the barrel became concentric. It now shoots incredibly accurately. I made and fitted a new washer and barrel seal and have enjoyed noticing the power return with use. The washer retaining screw was badly damaged and had to be replaced. The fore sight had been filed down to almost nothing so I build it back up with weld and filing, the rearsight blade and thumbwheel had been replaced with a solid piece of brass with a slot cut in it so I purhased a new blade and wheel.

I'm sure I read somewhere many of these were used in fairgrounds with cork firing attachments, I wonder if by the rough handling and sight modifications this was one of them?

I don't mind that it is very tatty and slightly cobbled together, it is a joy to use and I have been doing some very close range ratting with it.

It is however still very noisy- the inside of the piston is somehow very deeply grooved from the spring rubbing against it. The spring rubs against these grooves (they run around the inside of the piston, not along it as one would expect) wasting power and feeling jarring. I cannot find much information about the breakdown pattern online, could anyone tell me if a piston and spring from a more common model would fit? It is my only air rifle at present so I have nothing to compare it to.

I'd love a pre war .22 underlever next, anyone got an extremely tatty one otherwise destined for spares I could put back in use?

Best wishes, Chris.

Nice save (as the Americans say)!

Not sure about another piston and spring, Chris, but I would have thought a very thin piston sleeve (coke can?) would make it smoother to fire?

By coincidence, this thread on a rough BSA IMD has just been posted, which might suit you. Perhaps a private message or email to the owner may be in order?

http://www.airgunbbs.com/showthread.php?848980-BSA-Model-D-serial-number-48056-valuation

🙂

This post was modified 1 month ago 3 times by Garvin
ReplyQuote
Posted : 09/07/2019 10:27 pm
Whitworth
(@whitworth)
Member Registered

Excellent idea about a sleeve, many thanks! Now why didn't I think of that before? I was hung up on ideas of honing or machining a new piston but will certainly try that first!

Best wishes, Chris.

This post was modified 1 month ago by Garvin
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Posted : 10/07/2019 9:29 pm
  
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