ILa,
I think the old style FW top tension is pretty much the same design as the 66s and 99s. Check the TFSR site:
{
http://www.tfsr.org/publications/tec...achine_manual/ }
they have very excellent detailed instructions on how to repair and service those.
I'm not sure what tension our FW has since it's a bit newer. Can't remember if it's the numbered one or not.
The older ones are not that complicated though.
Joe