My ultimaker is currently running perfectly WITHOUT four of the grub screws.
I removed grub screws from the pulleys on the driven axle of both x and y axes. I think this allows the belt tension to be more even around the whole belt, as well as making the whole axis drive less overconstrained.
That said I could send you a grub screw
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robmiles 1
Apparently you can get them from Ikea, they are the same size as the ones used in the Deka curtain rail.
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