What do you mean set tgr still didn't work out of gun ? didn't the rear tgr catch the front one to set them ? Binding up may be crud, clean 'em up good. The screw between tgr's adjusts the amount of pull to set them off, screwed in to far and they will not click together. the screw in the back relieves pressure on tgr main springmaking it easier to pull back the rear tgr. Take a good look at new ones when they show up. If don't work inside gun may be a rubbing problem somewhere. I use an old oil lamp to blacken parts to be fitted. Put tgr's in gun then pull 'em out and look for black rub marks in mortise or scuff marks on tgr. Trim marks off wood with a small chisel, try again until no marks---should work, even if it takes 10 times fitting. Thats the way to fit all parts, soot transfer......Let usknow buckarooo....Tom (ex-buckaroo)