Originally Posted by Gus

Wolf,

No, the spindle shaft is smaller than 10.5. Dan also made/makes a 10.5 mm mandrel but it is not included at this time.

I just checked and the Art Rose mandrels use a ever so slightly smaller spindle size so they will not slide on to the Harrison spindle. I suppose you could have them drilled out but to ensure alignment accuracy I'd probably just get new ones from Dan.