Nothing critical was lost. There were some lessons learned. New mill, collet and back in business.Never a good sound or feeling, Dan! Hope nothing critical was damaged.
Make a center punch out of the shank.About 15 minutes in a 6mm endmill failed. Basically the endmill came loose, dropping down into the wood till it shattered. I believe it was due to a combination of dull cutter and loose/worn collet.
Glad to hear it ended ok . That’s a great piece btw
....That's one you should also paint.