No picture but I assume....not a good thing to do..... that it is an old Delta with a fixed arm and a spring loaded upper blade clamp.

This is something like a JET saw.
They never die. The upper blade clamps are a bit finicky for fretwork, but Gary Browning uses his JET for his work with no problems.
You might want to check out the site Old Wood Working Machines
http://www.owwm.com/