"Leon" wrote in message
t...

"Owen Lawrence" wrote in message
...

TDC? Top Dead Centre?

Yes


So you think the pulley is rocking/wobbling? I really cranked the set
screw and the pulley isn't wandering. I'll be very happy to try a new
pulley/key/set screw before taking more drastic measures if you really
think it'll help.


In the beginning I thought it was my motor also. When I tightened the set
screw the problem would disappear for a little while. I found that if the
set screw does not push down on the key and or flat grind on the shaft at
a 90 degree angle, TDC, it can loosen again.

Mine made a distinct metallic clicking/ticking sound with every
revolution.

One other trick that I forgot to mention. The object is to have the set
screw press squarely on the key. If the screw is not flat on the end, if
the end is at a slight angle, you can lightly file the end so that it
contacts the key squarely. The set screw can have a conical end but the
entire end should make contact with the key. Or buy a new set screw.