I have a UTG L96, with a metal trigger box, and a laylax piston and spring guide. With these hardy internals, I decided to upgrade my spring as well, to a PDI SS 3000 Spring. A combination of the spring power and repeated use has resulted in a problem- the section of the cylinder that attaches to the bolt handle has physically been pulled out of the cylinder body. Short of taking the $150 dive for a new one, does anyone know of some DIY fixes that could fix this puppy?