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The Pitts factory even screws up on the KP4 bearing housing fit after welding arms on.
Even a little extra press fit makes the bearing drag.
i put the 1" end in the vice and hand reamed the housings for a perfect fit!
i found this obvious reamer made for the job at a surplus price with free shipping.
https://www.ebay.com/itm/232480775841
Even a little extra press fit makes the bearing drag.
i put the 1" end in the vice and hand reamed the housings for a perfect fit!
i found this obvious reamer made for the job at a surplus price with free shipping.
https://www.ebay.com/itm/232480775841
![reamer 0907211411.jpg reamer 0907211411.jpg](https://cdn.imagearchive.com/biplaneforum/data/attach/63/63709-reamer-0907211411.jpg)