Any tips for doing the disk bobbins, fixit
Scissors and graphite for sure !
Scissors which have flat sharp edged backs to the blades. IE when the scissors are closed the 4 outer edges of the blades are machined flat and have a sharp edge. The blades are tapered. Keep the scissors closed and push them into the sprung side of the bobbins. The 4 blade back edges will cut slightly into the inside of the bobbin to grip it, and the large handles will give you some purchase.
Before trying to turn the bobbins I fill the opening between the inner disk hub and the outer disk rim at the bobbins with fine graphite powder of the sort locksmiths use - http://www.ebay.co.u...-8AAOSwPCVX9lYY
The graphite powder is obviously perfect for lock preservation (non liquid so it doesn't attract dust and build up crap)...but it is also good on the bobbins, so I worked a good amount into the gap around the bobbin edge and could see, and feel, that the bobbin was loosened up quite a bit. It doesn't wash off easily or dribble onto the disk face to contaminate it