I have been modeling HO scale railroads for many years now and am frustarted at having a very hard time installing metal uncoupling bars to the front & rear pilots. I drill the holes just fine but when it comes to installing the bars with the metal ring pins that hold the uncoupling bars, it seem that when more than 2 pins are in place and trying to place the third one, the ones that are in place come out. I would appreciate if someone can point me to a good technique to getting the bars installed. I have already tried putting open pins alone in first and then closing them around the uncoupling bar but end up damaging something when attempting to close the pins with pliers.
Help & advice from other modeleres out there is most appreciated.
Martin