I don't know if you have seen these, but they are very good links for the potted motor and screwdrivers -
http://vssmb.blogspot.com/2011/07/ge...g-on-your.html
http://vssmb.blogspot.com/2011/12/ho...rt-1-wire.html
Depending on the machine, I might be tempted to power wash for mud daubers. I've been fortunate and not found anything other than dried oil and lint in my machines. I'm not sure how I would handle if found what this person did ->
http://sewingrepairblog.com/you-can-call-me-batman
Janey - Neat people never make the exciting discoveries I do.