That sounds a bit like a Rolls-Royce for a Ford job. If you make adjustable plungers - you adjust them (but I admit you need to replace the corks every 5 years or so.) What was the life expectancy of an Ariel in 1937 ? - maybe 10 years at best - and the intervention of a World War to hasten disrepair.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.