Tip: Add this to your maintenance schedule

[TerryT]

I may be a little more heavy handed than most when tightening my bits ( I like TIGHT bits), but you want to avoid this if you can.

I would say every 500 to 750 change this little guy out so you don't end up drilling out a broken one like I did. It is stretched a little every time you tighten it. It cost me about a half hour of production today but I guess it could have been worse.