Front leg protection caps

[Krischu]

IIRC, the front legs of a seventy three have aluminum plugs pressed in the leg tube. Some spare part suppliers are offering round black plastic furniture plugs.

Does anyone have the exact measures of the inner resp. outer diameter of the leg end tube? I'm about to turn these on my turning lathe.

EDIT: meanwhile I had the opportunity to measure the leg tip myself. It's 16mm outer, 13.2 mm inner diameter.