[Jay H 237]

I just want to add something on the teflon idea. There is a good chance the threads on the screw and/or hole could cut through the teflon when installing the screw thereby rendering it ineffective. If you've ever taking apart plumbing fittings you would know what I mean. In plumbing the teflon merely takes up the very small space between the threads to prevent leaks not the high points of the threads. So in short I would be reluctant to just rely on the teflon for electrical isolation. There is one benifit I do see with the teflon on the threads and that is it will act like "Loctite" for the screws with normal use but still allow you to easily remove them if you blow a motor for instance.