i’m looking to build a couple of bar stools for my kitchen counter using (and i guess this is what you call them) spiral screw height adjusters for the seats.  i’m looking for the “old time looking” screw that as you turn the seat it adjust the height of the stool.  does anyone have a source for where i could get these screws?  i’ve tried rockler, woodcraft, and lee valley but all they sell are swivel seats.  any suggestions?

thanks,

jud