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I have repeatedly faced hurdles removing/replacing blades on my (two) grinders. I do have the two-prong tool to turn counterclockwise. But usually that's not sufficient. The underside apparently needs to be vice-gripped - according to comments from another question How to cut rebar with an angle grinder- I presume in the green rectangular area ?

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I don't have any wrench that fits that description that is both:

  • wide enough ~2 inches
  • thin enough to fit below the blade and above the lower nut/bracket

How have folks done this: is there a special wrench for this - or other approach?

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1 Answers1

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Hand grinders have a button to lock the spindle to remove or tighten a grinder wheel. It is usually on the housing above the wheel. Usually just a push button, that pushes a steel rod into a hole in the spindle, to lock it from turning. For safety should unplug grinder from power when changing grinder wheels.

Original Poster here I am adding a picture of the spindle lock to this accepted answer for full clarity.

No Name Grinder

No Name Grinder

Bosch Grinder

Bosch Grinder

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  • In addition to this, it's not unusual that the nut has self-tightened during use. Be prepared to hit the 2-pin wrench with something heavy to loosen it. Also be prepared for hitting the 2-pin wrench to knock the wrench flying - apply more force progressively! – Graham Jul 20 '21 at 07:42
  • Also be prepared that on no-name grinders the act of hitting wrench will likely cause the locking pin to break the aluminum casting, thus ruining the grinder. – jnovacho Jul 20 '21 at 09:04