Motor Shaft Extension ER Collet

7

It would get really long, but you could use a 5/16" collet:

http://www.elairecorp.com/makitaroutercollets.html

and an ER-16 extension:

https://www.timberwolftools.com/er16-collet-chuck-adaptor

(limited to 16,000 RPM)

Interesting that Sorotec goes so large on ER-16 collets. Maritool tops out at 0.4375":

https://www.maritool.com/Collets-ER-Collets-ER16-Collets/c21_56_61/index.html

(11.1125mm)

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