@dwcraig1
On my Kx with the 22 mm washer it is about 0.65 mm above the plate, without the washer it's flush.
I put a 1/4" bolt
through it (the complete v3 shorty), secured with nuts, put into an electric drill and ran it against a file down to 18.5 mm.
Nice thx for the tip so you haven't reduced the horizontal thickness of the 22mm washer I was thinking about that but maybe it's too difficult to do and I want a good result so first I will see how it looks, 0.65 is not so much but it is not flush and the main reason for the replacement was"a flush mounted atty" lol or maybe better I choose for a mounting without the washer, hmm..... I must think about that a little more, when it's possible to reduce the horizontal thickness without destroying the upper surface

that would be the best option I think, ah we will see when the FD arrives how it looks on the FV, in the mean time mine fire-button (sometimes not always) refuses to work so maybe I'm gonna replace that switch also if I can find one.