I posted a complete article on my website with this a long time ago. I won’t go into great detail in this post as you can get it all from my website at http://www.cvsry.com/car_%26_loco_mods.htm#Bachmann%20Coupler%20Mod Simply put in TOC’s words
Originally posted by Curmudgeon said:
Occasionally I get a Bachmann that has a problem. But, the mods I do to all fixes the vast majority of unwanted uncouplings. I replace the push-pin at the pivot with a #4 screw and a flat washer, removing the half-collar and filing flush with the coupler shank… TOC
I went with a machine screw rather than a wood screw and documented the procedure with step-by-step photos. Here’s a few samples…
For full details check out my website.