The guides are probably worn a bit "eggshaped", and your mandrel tightens on the non-worn area, making it seem like there is less wear than there actually is.
On one hand, for a slow-turning "side valve" engine, it will probably run for years with no issues from the worn guides. On the other hand, if you are restoring it to "as new" you may want to replace the guide, if they are available.
If not, an automotive machine shop should be able to easily (and at low cost) bore out the old guides and press new aftermarket guides into them. They do stuff like that every day.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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