Is it correct to have an empty blind threaded hole about 1" dia. In the aluminum heat sink block? There are two such holes, but only one is occupied by a component. I have a photo but it seems the forum doesn't do photos or links to them.
-----
Edit: Bought the four manuals and a diagram and parts list answered that question. Item 4 is apparently omitted in mine, the single-speed version, but is required in the variable speed one. Item 4 is a diode.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.