M6 is the correct thread size, and the Mapleshades are very nice, but perhaps overkill on the SL-1200. I use these on my SP-15 (same thread size):
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=240-717
and they work great at considerably less expense.
David
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=240-717
and they work great at considerably less expense.
David

