I would not change the elevation knob either, but I must point out the reason for my post, is that all the data from Duff's WW2 book and my own data from
Lend Lease rifles show a checkered elevation cap.

Duff's book, sn 421106 and sn 469909 both with checkered cap
Lend lease rifles 380931 and 471665 both with checkered cap