On Fri, 3 May 2019 02:07:26 -0700 (PDT), wrote:

snip

I just got the whole lower end assembly with shaft & ball. Removal turrned out to be painless.

So I hoped it could be, if it was acknowledged that all the valves /
bodies (from the same make / model / version) were interchangeable
etc.

I couldn't get the old O ring out so used a bit of linseed putty to reseal.

Ok, I was thinking silicone sealant.

£22.99 on ebay.

Check.

Cheers, T i m