Just take the set screw from the pulleys on the driven axle and put them on the pulleys on the driving axle. The driven axle doesn't NEED to have the pulleys rigidly attached. I'm running without those four screws (two per driven axle) and it works fine.
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joergen 2
IKEA.
it is a M4/0.7mm set screw, which is also used for in the DEKA/DIGNITET curtain wire system, and you can get a single one at the service desk, asking nicely. but regular hardware stores should cary them as well.
if all fails, cut off 5-6mm from a M4 screw, and cut a slot for a flathead screwdriver.
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