I pieced together a setup using parts from McMaster Carr.
These are the parts I used:
1 6464K16 PNEUMATIC CONTROL VALVE, FLIP TOGGLE, 3-WAY, 2-POS, MANUAL RETURN, 1/8" NPT
2 2639T7 PTFE SLEEVE BEARING, FOR 1/4" SHAFT DIA, 3/8" OD, 1/2" LENGTH
3 2639T15 PTFE SLEEVE BEARING, FOR...