[Kenwood] TS-440S tuning knob binding

[Larry Szendrei]

I have a Kenwood TS-440S which I bought brand new in the mid 1980s, 
which I have done my best to keep in pristine physical condition.

This morning I was repeatedly manually scanning up and down the band* 
with the VFO knob, and it quite rapidly started to turn harder and 
harder. Now it almost takes a wrench to turn it.

Anyone run into this before, and know how to fix it?

Also, what type of wrench is needed to remove the setscrew for the VFO knob?

* I was playing around giving out a few points in the June VHF contest, 
using the 440 in conjunction with the Hallicrafters HA-6 and HA-2 
transverters.

73 and TNX,
-Larry/NE1S

P.S. I just now joined this list in order to pose this question. 
Greetings to all!