Yes I have been using them for years on my pup but when the impulse spring goes bad you can not get any parts for it.(I have 3 for parts) I had Scott convert my Mosler cb 40 to 1200cc and had planned on switching to a slick, but the new crank is not recessed to allow the slick to work so I am using the fairbank morse. If you can use the slick go for it I got a brand new one for $60 on ebay.