/diy/ - Do It Yourself

>>1761384
It's a protector plate covering some of the internals, it's removable by the three screws in front. Where I worked we made stoppers of various lengths that fit in there, it was very useful for shorter parts, especially for production.

If your putting a bar thru the barrel there should be a piece similar to pic related, stops some chips from getting in there, but you should disassemble, lube and clean out the chuck regularly because shit will find it's way in there.