Hi. I need some help. I took apart my FILs Thompson Auto Ordnance 1911 last night to clean it including the mainspring housing and the spring between the mainspring housing and grip frame. Put it back together and now the hammer doesn't lock back. I can squeeze the grip safety and the trigger functions as far as going from not being able to move to moving with the proper travel but whatever engages the hammer to lock it back isn't doing its thing.