Screen door wheels every hardware store has them.
1 set large 7/8in. 1 set small 3/4in. screen door wheels 1/4 in thick piece of wood you will need longer bolt them come with the wheels. Drill 4 holes two for the bottom wheels 1 1/2 in. apart, one on the top of the slot and one at the bottom of slot to adjust the top wheel. ( you can drill the slot out or use a dremel) The wheels have a nut one the back that act like a spacer. The only tough part is cutting a groove in the top wheel to hold the tang. I used a razor saw it needs to be narrow to hold the tang. $5 and a half hour your bending frets
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Posted pics and directions Rose sorry I didnt complete the post hope this helps if not just Ask.
very cool fiddle congratulation on the 2 by 4 win!