FYI: The string winder I use is only stamped SWI which does not mean anything. It could have very well been made for a mandolin originally. Some of the new guitar buttons are most too large for it. Further, I believe the violin machine heads were available some years back form Geo Heinl & Co. Ltd. of Toronto, Canada. They no longer list them but do still list a mechanical non slip peg. That being said, I personally believe there is nothing better than a well fitted set of conventional pegs both for cosmetic appeal and tuning as well as over all sound quality.