I had JOE at perks spin balance in Tremonton Utah ,Balance my snowmobile motor while it was in the snowmobile , Perks had the snowmobile for about 19 days! Joe told me it would take 3 days , I went to get it once but would not except in because he had it vibrating so bad ( 95 miles round trip ) , Joe said he would get it balanced right and call me when it was done . Here is perks work after 19 days and all of his excuses !! You decide !! http://www.youtube.com/watch?v=QjWceKKUixQ