I'm sure someone has made one of these, but I can't recall ever seeing one if so, I'm sure none were ever used this way
I needed to clean the inside of a formed beam but no grinder would fit except for little rt angle pneumatic die grinders but those things take forever to do much.
So I made a 3inch long extension to fit the 5/8-11 thread on angle grinders out of a length of 1" round bar.
The major added benefit is the ability to install the cup brush upside down enabling me to clean the underside of the formed flange
This was very important to me since there is a cam follower bearing that rolls on this surface
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