Usually I am looking for help when I use this BBS so I thought that I should offer to contribute something for a change.
Having bought and sold lots of the Vemco drafting machines on eBay, I have had them apart from one end to the other and have seen most of the typical problems. I would be glad to advise anybody out there with adjustments and repairs on their elbow drafting machines.
These machines are really an engineering work of art and pretty much indestructible and you can buy them for pennies on the dollar. There is no reason for using a T square and triangle when these are available.