Hi Mark,
fortunately Swagelok got back to me saying that they will produce a brass 1/4" BSPP to 1/4" tube adaptor which together with a 1/4" - 1/16" tube converter will be enough to connect everything. Downside is waiting 2 weeks for it, but I'm in no hurry, so it's not too bad.
A friend of mine might also sort out a needle valve for me sometime soon, so I'll be using something meant to be used for precise throttling instead of the ball valve.
Looks like all the pieces are slowly moving into the right places.
Regards,
Tom



