I had an old (about 40 years old) Milwaukee auger saw that stopped working. I thought it might be worth fixing it myself and bought these. It took a little effort to get the old ones off, which were clearly worn out, and a little more effort to install them. Not sure if it works as well as a new saw but I can definitely say it works well. If your old saw (may be suitable for other motors) no longer turns or turns very weakly, this can save you money before buying another tool. Try it - it's very easy to change and it's worth it.
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