If you can you are better off getting a 1/4" collet/chuck but if you can' then look up adaptor bushing at:Bub said:Where can I buy a 1/4" insert to go into a 1/2" collet? It's for the ELU 3338-2, and so far none of the well-known suppliers I have called stock such an item. ?? Thanks much for any help. Bub