Robert,
I'll tell you how I did it... and it made a big difference. I
happen to have been into 1/4 RC airplanes before I got so
completely tied up in my TR4. I that hobby I had a large
propeller balancing tool. Here is a paragraph from a rely I made
on the last year.
FAN BALANCING: The device I used was actually from my 1/4 and
1/3 scale RC airplane hobby from the 90s. It has a low friction
stand that has supports with intersecting discs on the top on
each side and a cross rod that has an adapter for grasping and
centering the center hole of a propeller (or TR fan). I was told
by a local guy here that the bicycle shop uses a bigger version
for fixing bicycle wheels. You turn lightly and watch the heavy
blade drop. You can then file off some metal on the heavy
blades... OR... add weight to the light end. I used the original
TR scheme of center mounted weight plates and got it to balance.
But the TR metal fans are WAY TOO HEAVY and crude. The TR250
yellow plastic fan is the right solution.
My real goal would be to find a way to mate a modern light weight
liquid clutch fan to the TR pulley.
Hope this helps. Try the local bicycle store repair shop.
Brian Sanborn
'62 TR4 CT16260L-O - Groton, MA
My TR4 Restoration Web Site
http://www.net1plus.com/users/sanborn
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