I visited a friend yesterday who is running a large prewar O gauge floor layout. I was struck by the quality of the prewar 072 switches compared to the 6-5165 and 6-5166 switches I have that were purchased in the 80s and 90s. Compared to the prewar switches, the points of the modern era switches do not fit as tightly to the stock rails and there is a lot more slop in the locking mechanism. I have filed the points on several of my switches to get a better fit but haven't investigated the locking mechanism. I pulled out some postwar 022 switches and found that the locking mechanism is tighter on those compared to the modern switches also.
Has anyone investigated improving the modern switch motor locking mechanism? I would like to tighten mine up somehow. Any hints will be appreciated.