Not very efficient cutting, but I got 18 roughs out of a 6" topfin I bought a week ago. Should be able to get at least 30, if not more. That should do me for a while. Now for the Michelangelo work ...
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If there is going to be a "Next time", I'm going to pre-cut the length with a 10" concrete roof tile angle grinder. Would have saved some time.
The 545-Diamond-Wheel is better, you get way more stix. I tried the 1 3/4" wheel yesterday, not happy with it.
I hold the 6" topfin in my hand, dip it into a cup every 10 seconds of cutting. The water does help, does make the cut much more buttery.