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There is often a bit of fiddling required with the spacers to get it working right. If the spacing is not right you can either have parts of the mount physically foul on one another and cause drag, or end up with too much preload on the bearings causing a dragging axis, or on the other hand you can end up with too little bearing load and an axis that is not stable due to end float.
The Astrobaby rebuild and supertune guides are a good resource when it comes to working out shims, but even if you have a kit of sidderent ones you may find like a friend and I did on one mount that you have to choose between a bit tight and draggy or a little much end float. We chose end float and that particular mount performed quite nicely.
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