Al Smith
Addicted to ArboristSite
To Mike Mandry;I attempted to send you a PM,but I don't thnk it went through.I think I may have a solution to your problem with the 1/2" spur.If you go to e-bay,look up a seller,that goes by bc-wuz-here.He lists a Homelite spur,7 tooth,didn't say 1/2",but most assuredly is,cheap[buy it now].This is where I got my 8 tooth for my 650 McCulloch.I have nothing in this,only passing information.I think that most Homie gear drives were 9/16",where as Mac's were 19/32".Good luck