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Dear ea69,

really nice work. Thanks.

I have remixed it and added a small box on to be attached to your track. The box can be filled with "mass" - so the bolts you mention are not any longer required.
In addition my spool had a very (48mm) inner diameter. This was to small for your caps to center it properly. Have added some adapters as well in mine remix.

Feedback welcome. Thanks for your excellent work.

mass-cube and adapter for spools with smaller diameter
by behn66