Yeah, thanks. I was thinking of checking at my local store. I would think the Summit would work better for the FL-820S as it's > 3 in dia. which would hit both guide wheels on it. The smaller ones don't.
IIRC, the HF cutter maxes out at ~ 3&1/4 in. so the 820 would be at the limit.
Anyway, I got a bunch of HF 20% off coopins to use.