Let me rephrase - I understand the claw and its concept, but I was curious to know if there should be any play in the rods. When you tighten the C clamps down for belt tension, it tightens up the rod as well. Should the rods be completely tight or should there be any loosness or play? I noticed that in the directions you have to find a happy medium between the belts being too tight or too loose. But any additional tightening also seems to effect the rods being too loose or too tight. I guess I'm trying to find the happy medium so that the rods don't shift in the slider blocks.
Part C is called a "claw". You really have to tighten completely otherwise it won't clamp the rod properly.
When you assemble that piece, the current instructions suggest one nut on each side along with the screw head.
If you want to tighten your belts more you loosen that screw so the head sticks out more. This is how I tightened my belts and haven't needed anything else yet. Except I might have added a slightly longer screw (this may have involved a hack saw to get the right length - I don't remember).
This links directly to the claw assembly I'm talking about:
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