[GRC]

If you're going to drill a hole in a deck with an internal azimuth screw, have an assistant standing by with a vacuum cleaner running to keep all the debris from the drilling away from the internals of the cassette deck.

If you want to get the azimuth 'back to where you started from' for any reason, might be an idea to invest in some alignment tapes to give you a reference point.

That's all I got for now...

Regards, Graham