Hello Goldstate...been a little while. Well the rubber tube I had on the brass breech bolt came apart. It split...guess the rubber wasn't made for the sustained stretch however....
I figured it out finally. I inadvertently broke off the magnet (used for BB's) that was embedded in the end of the brass bolt. I was filing the groove I mentioned above widening it preparing to use a longer piece of some kind of tubing. What I settled on was
surgical tubing...very soft and pliable, to use as the plug. I needed something that could compress enough to get into the breech and pliable enough to expand and block the air from exiting when the gun was fired. It worked perfectly if only by accident
.
I hadn't planned on ever shooting BB's through it again since they bang up the barrel so I won't miss the magnet.
I was filing to widen my original groove and ended up with no magnet and the brass bolt filed down to approx.
2.5mm dia. (measured with a digital caliper) in the form of an approx.
5/16" long
pin. The brass got too thin and broke off right at the end of the magnet.
The size tubing I finally settled on is called
1745 natural rubber "sling shot" tube on Ebay and is cheap. It measures
1.7mm inner dia. and
4.5mm outer dia....nice since 4.5mm is the size of the barrel inside and a 1/32" wall. Slide it over the hand filed pin remaining on the end of the bolt (with the magnet removed) and leave about
1/8" hanging over the end. Put a little oil on it and slide it in the breech end of the barrel. It will meet a tiny bit of resistance which is what you want and it will block the leak when fired. Be sure not to file the brass bolt any smaller round than
2.5mm...the
slight bulge created when the tube is slid over it is what blocks the air. Give it a shot.
Thanks, Bruce J (Biznawich)