Dave,
Appreciate that you provided the GP-7 and Baldwin illustrated parts breakdowns and part number / photo of the 20mm motor attachment screw. I now realize that my GP-7 screw issue is a non-issue. I didn't realize before that the long 20 mm screws were used in the powered truck to screw into the motor. The two 20 mm motor mount screws on my GP-7 powered truck are both screwed in and snug and the motor runs without noise/grinding ... good. As for the non-powered truck (see photo in my pdf attachment above), since there is no motor to mount to, then there is nothing to screw a screw into either. Apparently, Lionel provided the same motor mounting through-holes in the bottom of the unpowered truck as they did for the powered truck even though there is no motor on the unpowered truck for a 20 mm screw to attach to. Using a flashlight, I can see through the unpowered truck screw through-holes and up to the underside of the motor mount plate and see the holes in it that the motor mount screws would go through to then screw into the motor mount threads. So, for the unpowered GP-7 truck, the motor mount screw through-holes are non-functional.
Anyway ... your added info enabled me to sort that out for my GP-7. Thanks.
Regards,
Tom
