I thought the instructions were in the manual for the 66, but discovered only for later models and the 99. To see a picture of how to replace the slide plate see https://www.manualslib.com/manual/15...9.html?page=29


Janey - Neat people never make the exciting discoveries I do.

Look for a little piece of red felt by the bobbin. It should be a wick for lubrication 66 is the same as the 99 except for length. 99 manual should work fine for it. Some differences in time frames though.

Glad you caught it.