My original message to Frank at Sergent Engineering, (He suggested I share this problem with you):
I built a bunch of your HO Standard Gauge couplers about a year ago. I did all the steps as the instructions said and made sure each coupler was given the "Break in" They all seemed to work just fine. Then, due to surgery on my foot, I didn't operate the RailRoad all winter. When I finally got started again, about half of the couplers won't work. It's almost like they are glued shut. Is it possible the ACC has migrated to close up the knuckles? I used as small an amount as possible and, as I said, they all worked just fine, until they sat over the winter.
I've tried to put a drop of Liquid Wrench in the opening. No help.
I've squirted a puff of powdered graphite in. No help.
I've tried a small drop of NeoLube. No help.
Only thing that has worked is to disassemble and reassemble the coupler. That works. Sort of a pain in the rear to have to do that on half of a 100 car fleet. VBG
I really don't want to redo the entire fleet. Well, half of the entire fleet.
They worked so well before I stopped using them in November.
Thanks for any helpful suggestions.