You presumably have the side-mounted lever [see edit]
Looking at items M11, M12, M13 here: **LINK**
https://www.myford.co.uk/acatalog/Myford_Super_7_Tailstock_Assembly.html
… it seems inevitable that gravity will make it settle like that, unless something stiffens the action.
A Belleville washer, or an O ring, might do the trick.
… Myford moved the lever instead … so defying gravity !
MichaelG.
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Edit: … or are you referring to M1 ?
Edited By Michael Gilligan on 25/03/2020 07:41:21