Re: h&r premier 32 s&w
There are two cylinder stops. One is the sheet steel thing you replaced, which holds the cylinder when the trigger is all the way forward. The other cylinder stop is part of the trigger body which rises from the bottom of the frame as the trigger is pulled all the way back. The hand and the trigger body hump/cylinder stop locks into the cylinder notches at full cock, which is when the trigger is all the way back. Sometimes, the hump on the trigger body can seem to be too short to lock up all of the chambers. This is sometimes caused by a cylinder pin that is bent up too far away from the lower frame. It could also be caused by an improperly installed replacement trigger.
I hope this is of some help.