I think it is better to get a digital caliper and measure the spindle. Even if the manufacturer specifies the spindle diameter, this measurement is often times rounded up. Digital calipers go from about $30 and up.
For the Mint tractor, it is better to have the exact spindle diameter to 1/10 or 1/100 of a millimeter. This is one of the main reasons why the Mint tractor is so accurate.
Best,
iSanchez
For the Mint tractor, it is better to have the exact spindle diameter to 1/10 or 1/100 of a millimeter. This is one of the main reasons why the Mint tractor is so accurate.
Best,
iSanchez