Adjustable Motor Mounting Bracket / Counter Shaft Bracket

The two sets of flats act as detents. The screws should be adjusted so the belt is tight on the smaller flats but loose on the larger flats. The screws shouldn't ride on the round part. This could chowder up the shaft making difficult to remove to replace the belt.
 
I think mine is riding on the round part when tensioned, I'll have to look. The lever position in the picture I posted is when it's tight, and of course the position isn't critical.

As for how much tension, it doesn't need much... mine is tight enough that it never slips while cutting, but it will slip if I forget to disengage the back gear after tightening the chuck, so it doesn't hurt anything.
 
The screws should bear on the flat surfaces only, not the rounded part of the shaft, as they can and will (as RJ has already warned) chew up the shaft. I've gone one step further and changed the screws on all three of these setups I have with brass screws even though the stock issue were steel.

-frank
 
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