Cana anyone recommend a plastic wrench that doesn'e scratch the metal?

@zavato I agree with you though... speaker/amp manufactures should consider definitely consider thus option.

GOT IT!

Check out Knipex, German manufacturer of  (?) toolifile  tools for freak tool users. I got a beautifully German pair of channel-locks that came with a pair of synthetic “dentures” that snap onto the jaws. I use it to hold gold-plated connectors while doing the real torqueing from behind the face/back plate. I think they were about $25.
We’re audiophiles, man, we don’t need no stinkin’ cheap tools!

I’ll check into that @denverfred thanks!

@denverfred - do you happen to recall what model it is from the Knipex tools?  I searched on their website but can't seem to find the one you described.  Appreciate if you could let us know.