I've been asked about Vostok winding-stem length; as far as I'm aware there are 3 different lengths for Amphibians.
I'm not 100% sure whether they are identified by: short, medium & long and also whether Komandirskies winding stems do differ in length
Perhaps another comrade has more on this ?
Anyway, this is the information I have. The pictures are in the sequence: short, medium & long.