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Valves ease made
The Valves (and the spring retainers) I made with metal shims and a brass rods 2.9mm (common in the shops). On the left side on the picture the exhaust, on the right the intake valve, in the center the standoff for centering and aligning the shims and stem.
8 pieces shim inner 3.2mm, outer diameter 13mm exhaust and intake valves
4 pieces inner 6.4mm, outer diameter 16mm for intake valves (all common in shops)
Cut 6cm long full-brass pieces as valve stem and make to one side a threat M3, approx. 4mm long.
Take a piece of hardwood as building jig approx 15/20mm thickness.
Make a bushing, the diameter is corresponding with inner hole dim. of the 16mm shim.
Into this bushing (ca. 15mm long for a good alignment in the wood) cut in the center an internal threat M3.
Drill a hole into the hardwood and put this bushing with a little got over, to fit the 16mm shim in center hole.
Now you can built the valves by gluing with epoxy, or soldering
screw in the valve brass, put the 16mm shim over the bushing, glue/solder the smaller shim into place and fill with glue/solder for a fluiding-transition to the stem. Build also the smaller valves with the jig, but first make flush the bushing with the surface of the jig.