To fit the valve lever pivot I drilled a 5.5mm hole in the assembly and then opened it up to 6mm with a slot drill to give me a flat bottomed hole. I then chose a piece of 6mm mild steel which would be a press fit in the hole. Faced it to length and then drilled and tapped 2mm.

To tap the 2mm hole, I fixed the tap in the tailstock chuck but left the taper loose in the tailstock and turned the chuck by hand. Worked a charm.

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Both parts before being pressed together.

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And using the big mill vice to press them together.

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And the whole assembly finally complete with the valve lever fitted to the pivot.

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I drilled and tapped both bearings.

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Decided to give the bearing supports a splash of colour.

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Started work on the valves with four blanks to the appropriate length. Clamped a piece of scrap aluminium flat bar to the mill table, and with a 6mm ball-nose end mill I cut a groove 2.8mm deep.

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This was to hold the valve blank in place while milling it.

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I milled the slot in the valves and then cut a 1mm slot on the backside. This should help in adjusting them with a screwdriver. I also made a light centre punch mark to show me on which side is the milled slot.

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As these valves are a one part construction as opposed to a two part construction as shown on the plans, I turned down the front part of the valves to 3mm.

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And here are all four valves complete.

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To give me an idea of the size of this model and the base, I assembled all the finished parts together and put them on an A4 sized sheet of paper.

Drawings here

Part 18 here  Part 20 here