You could put some blackening on the lever where it might contact the wood. Be careful putting the stock back on so the blackening does not touch the wood. Then dry fire with some snap caps and cock the gun. Disassemble and be careful to make sure that the stock does not come into contact with the cocking lever. Look on the stock where the cocking levers may touch it and see if there is any blackening. If there is, it is coming in contact with the wood.