On 4 Sep, 09:55, Tony Williams wrote:

2-pole shaded pole motors are readily available,
but only with a 6mm shaft these days.

To get a 0.25" shaft might mean looking in old electrical
equipment.

Router collet shim from a cheap router 8-)

Along with grinding the 6mm cutters into trammel points or doorstops,
it also helps to reduce the risk of ever using one of these dangerous
6mm cutters in your 1.4" collet.