
I have been looking for an adapter to fit my Festool circular saw hole. I tried 1 inch and 1 1/2 inch. not good. 11/4 was perfect. Festool is as good as they are at charging ridiculous prices for cheap stuff. I think the Festool part to change from the saw to my 21/2 vacuum system is about $50! Once I figured out the size, I was able to go from a saw to a rubber boot to a cheap adapter. It's not a pretty transition, but it works great.

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