My friend bought a blower that was (or had been) on a flathead. He has been looking for one for some time so he jumped on this one. It does not have a pulley so he is looking for info on what size he should use and any other info regarding the spec on this thing. The seller said it was a Weiand unit but there is no info on the unit. Got some pics for reference. While I was there I rotated the unit and was surprised to see some galling on the rotors. When I pointed this out to my friend he said he wasn't terribly concerned. Is this a common issue with these units? Any advise would be greatly appreciated.