The problem is that I feel that something blocks a smooth movement and the pulleys wobble like crazy. I still can't figure out why that's the case. I loosened the end caps and this helped quite a lot but the uneven resistance when moving the head is still there. I have also tightened the tensioner screws with the help of anoter screwdriver blade - these should be somewhat tight.
In this video from the assembly instructions the head can be moved very very smooth and evenly. Sadly I am very far away from it:
It doesn't look too too bad... the sound almost sounds like a grating metal-on-metal sound more than anything to me - but maybe that's just the audio quality. You can't really loosen the belts much but you probably don't want to... even if they were a bit tight now, they'll soon loosen up a bit with use.
When you try to move the head around, do it by pushing on both sliding blocks at the same time. That way you aren't torquing the head, nor bending the cross rods. If its hard to move with fingertip pressure, try loosening the end caps on the 8mm rods, and see if that helps them turn easier.
You can also add a few drops of light machine oil to help lubricate the rods. DONT USE THE GREEN GREASE - it's only for the Z screw.
When you're tightening the tensioner screws on the block, you need to insert something to stop the nut turning. A screwdriver blade might work, or the tips of a pair of needle nozed pliers.
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