I picked up a 230v 30 gallon compressor and have decided to get some air tools. I was gifted this Cornwall 301 grinder and I’m confused on how to set it up - there is an attachment on it that isn’t stock (at least based on the pictures I've seen) and I cannot remove it. The manual is of no help and I’m feeling dumb lol. I’d like to be able to sand/grind with it. Any input appreciated.