This is just like my other model the old mechanical expander. I made a new version because the old version was fragile and it required sanding to make it run smooth, So I Fixed these issues with the latest model by adding higher tolerances and making the cover pieces stronger. As you can see clearly in the photo below.

The White One is the New Model

This I may be biased but I feel this is quite an awesome model thats very fun to fidget with.

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