I bought the HKParts tool and I've followed the text-based guides from JodyH and HKPro. I'm stuck and I can't find a video detailing the procedure.
Basically, I'm pretty sure the TRS is properly seated. I can get the trigger pin most of the way through the spring by wiggling around the slave pin. However, at some point I hit a wall -- no amount of wiggling the spring will get the trigger pin in any further. My guess is the trigger pin is slightly out of alignment with the hole in the frame. I've attached two pictures of where I'm at. Any advice?