Harp Mounting Screw Size

[jakejoseph]

A search did not turn up any information - Can someone remove a harp mounting screw and tell me the size?  A 1/4-20 is too big.  A #10-24 is too small.  A M6 1.0 does not have the right thread pitch.......Is it a sheet metal screw?

HELP!

[O.Lahoz]

The Rhodes Manual Service only says:

...the harp supports use #7 drill...

[Ben Bove]

i dont know the sizes, but know for sure that "Fender" labeled pianos (i'm guessing 70-early 75 grey cloth) are woodscrews and post 75-80s are machine thread screws, I believe because the early models were supported on wood blocks and the later had metal supports.