The depth of the space for a seal in the Autavia (1163 as an example) crown is 1.5mm so you would probably need 2 o-rings of the size you are using to make a good seal?
I am working on this and will post a solution when I find it. I have not found a used crown with a good seal in it yet but it appears that it must be a tube shape of 2 o-rings to make a proper seal. Removing the retainer washer on the back side of the crown causes so much damage to it that I have had to make a replacement washer for the 2 I have taken apart so it would be best if the seals can be installed without removing this washer. Please let me know where you got the seals that you used? Thanks

: I have been wondering the same thing. I was able to get a 2.15 x
: 0.75 mini o-ring from an assorment in the crown of my Autavia
: and 1.7 x 0.5 mini o-ring in the pushers. I left the movement
: out and it passed the static bucket test. I'm going to stop by
: my local watchmaker that I'm sort of learning from and have him
: pressure test it for me. I will let you know the results.

: I'm not ready to go diving with it but at the very least I know
: that the the watch is safe from rain,handwashing,etc.

: Eddie