I have been using these for a while and they work really good, the 3/8 length .25 cutter you can get pretty short into the collet so the extension isn't too much. https://www.amazon.com/dp/B07KMCWWL1/ref=cm\_sw\_em\_r\_mt\_dp\_YMQWZ35MBJQP4BEJSF2X?\_encoding=UTF8&psc=1