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ZBROIA KOZAK BREECH SEAL REPLACE

i wad decocking the koazak i think it is the shorter 330 model , not sure it's been a couple of years , & blew out the breech seal, & i have not had any success in replacing it, was using a wooden dowel rod , anyone know what the trick is ? TIA
It's really not all that hard, just takes PATIENCE. Run a rod in from the front to act as a stopper, use something like this...smile.amazon.com/gp/product/B01B1TBB10/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1, takes about 5 min with practice, if you have old eyes, use a magnifier, a smidge of lube helps also. I'm using uxcell Fluorine Rubber O-Rings, they seem to hold up a bit better, YMMV. Of course you insert the o-ring from the breech end, tweezers help also, fold it up and shove it in then fiddle with the probes. Enjoy.