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Should the outer gears slip/spin on the shaft.

In my case they are so tight, i had to knock them in with a rubber mallet.. I cant believe this is righ, as surely they would have been made as a 1 piece model?

I am wondering if i need to scale them X/Y a little (as per the comments below) to allow the gear to turn on the shaft..

Should the gears spin on the shafts? Or do the screw simply spin?