Fx impact loose side lever

Thank you guys for help. 

There is one rubber ball on the left side since new.I found out there is a gab between the hammer block and the barrel support. Maybe I should unscrew the linkage a bit to make it longer. For now I used sponge tape and it's working perfectly. 

Any suggestion is really appreciated.

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Looks like problem is with the cocking handle linkage. There is a pin pressed into the bottom of the aluminum block where the cocking handle is anchored. The pin will not bend (only break) as it is hardened but the aluminum block is soft and you can easily mar the hole if you were to pull the linkage back too hard when cocking or in maybe your case force it closed. Also you spoke about unscrewing the linkage to make something longer. I beleve you are talking about the rod that attaches the block to the probe? Adjusting that will only change the depth of your probe into the breech. If you were to screw this rod in making it shorter you could bottom the probe out when closing the breech which would then force the pin i was talking about forward causing the damage i was talking about. Is that maybe what happened?