older style stone with holders along side more modern carbide cutters. pilot and spring along with suction type lapping tool and prussion blue shown on bench.
adjustable stone dresser. used to clean up existing angle of a stone or grind a specific angle.
grinding seat. pilot installed in guide, then a bounce spring added and then the holder with stone which is driven by the electric sioux motor.
One method to test the seat/valve sealing is to first add enough mineral spirits to cover the seating junction while holding the valve down with light pressure and apply high pressure air with a blow gun either in the intake or exhaust port and direct it around the seat/valve seal area. Any leak shows up as bubbles and will require additional work.
assembled testing using a vacuum pump.