Question

I have a customer who found a Marble folding tang rear sight in pieces, packed in grease, and after I cleaned and assembled it, the spring won’t push all the way into locked up position. I tried to twist the spring back another hole to increase tension and there is too much pressure for me to hold in place while inserting the screw. If I could get it in the next hold it would snap up faster than the firing pin!!!!!!! I must be doing something wrong in the assembly of parts.

It pops up great and hits the front stop, but the rear stop doesn’t move up tight and allows about 1/8″ slop in front to rear movement of the sight. I soaked it in an oil bath overnight and it is better. I can’t find anything on the internet on how this sight is assembled.