Worked on a Tristar 20ga double years ago that stopped cocking one hammer
Turned out that the "cocking lever" had bent at the pivot point.
Upon examination there was some materiel in the slot for the lever and rather than remove the materiel they had simply
ground down the lever to achieve the fit. The materiel removed from the lever was primarily around the pivot point. Eventually,
the remaining materiel at the cocking lever hole broke and the lever itself then bent.
I cleaned out the slot and made a new lever.
Poor assembly and questionable steel in my opinion.
I'd look for one of the older German guns. Usually a number of 16's available. Take off the cheekpiece if you wish and perhaps open the chambers and chokes.
