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Old January 13th, 2016, 13:09   #4
Cloven
 
Join Date: Mar 2009
Location: Owen Sound, Ontario
I have determined the problem:

As you loosen the screw it unthreads from this little block. The top of the screw pushes against this collar, so loosening it pushes the block downwards into the barrel. The little collar is weak and broke, so unthreading it just pushed the screw up against the inside of the body.
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