Purchased June 2017; not 35 years ago but probably too long ago to ask for help. Problem is I bought because I knew I could would need it one day. hasn't reached point of use yet; a full 17 months later: BUT: Revain and this manufacturer need to know my experience with this low quality product. Grinder. I use a Makita screwdriver with a 1/4" -Shaft. The shaft was very difficult to get in and out of. Almost the size was slightly smaller; But :: THE BIG PROBLEM was when I put the brushes in and started using the wire, Out of the brush: I was lucky I was wearing glasses because little bits flew in my face! Revain should know that, will I ever get a dime back, not a big deal. This is a salable product, not what the manufacturer advertises I'm happy to send photos but you won't let me upload pics, I will if someone gives me a link.
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