Insulated Shoulder Washer Positioning

When undisturbed, the nylon washer is usually underneath the lug. The shoulder protrudes though the lug. The protruding shoulder is squished to provide insulation from the screw head.
Usually the shoulder appears like it was melted to provide the barrier, but I've never been positive.

I don't really see an issue with putting the washer between the lug and the screw if you prefer.

If this is for that 2024 motor you are repairing, often that screw is made of plastic, there is no washer, and the lug has a smaller hole to match the screw. I have never seen documentation on this, but I have seen enough late motors to be confident that they came from the factory this way.

C W Burfle posted:

When undisturbed, the nylon washer is usually underneath the lug. The shoulder protrudes though the lug. The protruding shoulder is squished to provide insulation from the screw head.
Usually the should appears like it was melted to provide the barrier, but I've never been positive.

I don't really see an issue with putting the washer between the lug and the screw if you prefer.

If this is for that 2024 motor you are repairing, often that screw is made of plastic, there is no washer, and the lug has a smaller hole to match the screw. I have never seen documentation on this, but I have seen enough late motors to be confident that they came from the factory this way.

Dude, you're answers are so right on target. First, there was indeed a mostly melted nylon screw - needle nose needed to remove. And, as you said, undocumented everywhere I looked. Couldn't find a replacement so I cut a nylon shoulder washer down to size, drilled out a solder lug for a custom fit, added a regular screw and the world is now Right!

Thanks once again!

Dude, you're answers are so right on target. First, there was indeed a mostly melted nylon screw - needle nose needed to remove. And, as you said, undocumented everywhere I looked. Couldn't find a replacement so I cut a nylon shoulder washer down to size, drilled out a solder lug for a custom fit, added a regular screw and the world is now Right!

Was the thread metric?

Not sure if the nylon screw is metric or how I can even tell. As you can see in the pics Its a very fine pitch thread - that's a 4-40 flat head on the far left for comparison - Threaded portion OD is 0.110" on 4-40 and only 0.010" on the metal and nylon brush holder screws.

You can also see where the nylon screw is pretty well boogered up.

This is the adaptive hardware I made using a cut-down shoulder washer and a drilled out solder lug