No. Many factors involved. First it would be good to know what particular game although they all work similar. I see you have both Williams and Gottlieb.

I take them completely apart and clean everything and look for worn parts because that does happen. And a tiny bit of lube in only the places the factory used it. Sometimes springs have been modified or replaced with the wrong ones.

When put back together switch adjustment can be tricky. Too much tension can hold the reel at the 9 position switch. Sometimes the 9 position cam gets a flat spot that can hang things up too.

Low power can sometimes be traced back to a bad electrical connection somewhere. Relay is involved too.

I've taken apart a few WD-40 games. Must have worked for a while because it gathered all kinds of dirt and crud before it stopped working. The damage wasn't totally irreversible, but it sure gums up the thing and makes a mess.

Since the op is now mia, and we don't know what game he is referring to, I'll throw my tip on the later Williams score reels starting in the mid 60s throughout the 70s out there.

They are pretty simple in design and function, and easy to get working if they do hang up. Only thing I have had to do out of the ordinary, is sometimes the cam that drives the switch lever develops a tiny flat spot which results in a small point on the cam. A file can be used to round it off, and everything will work fine again.

I use tiny dabs of super lube on the cam and the post it rotates on after I clean them, as that is where it looks like the factory lubed them, but that old lube has long since solidified.