Magneto Engine dip stick dimensions

[squeak]

Full mark is 1 1/2”

Total length to underside of ball is 7”

To minimise oil loss at the dip stick hole I use a small, heavy piece of shoe leather tightly slipped over the stick, that rests against the crankcase. Does it work you ask, well a bit.
Is there any truth to the rumour that the same dip stick full mark can be used down the filler plug hole in a 3 sreed gearbox to check oil level?    cheers  Russell