Electric Angle Grinder - 4 1/2" - 11 A

I bought this grinder to take about a quarter inch off the top of a concrete base for a 3' x 5' granite front step. That is a significant amount of grinding. I used one of the DeWalt diamond grinding wheels and had no problems. I was a bit concerned that the grinder would ingest the cement dust and croak on me, but it seems to have suffered no ill effects. I did set up a big fan to blow the dust away as much as possible. So it's a good grinder. What didn't I like? I wish the spindle lock button was easier to engage. I find it difficult to engage, especially with gloves on. I'd like to be able to "lock the lock" so both hands could be free. That would probably require an interlock with the power switch so one coudln't turn it on with the spindle locked, but that should be possible.

Just got it, today, but I already like it, A LOT. Easy to work with. Does the job. Not overly loud. This is not a long term review, of course, but as of right this minute, it does exactly what I wanted from it. Thank you.

[This review was collected as part of a promotion.] Bought about a year ago use it mostly for cutoff wheels it's super powerful doesn't bog and hasn't fried like solve competitors grinders have in less time

[This review was collected as part of a promotion.] Just bought this, needed it immediately to grind down some metal for welding. Worked like a champ, lot of power. No issues at all

Does anyone know if there's a special nut to hold grinding wheels in place? If so how do I order a new one.