valve stems aren't titan but made similarly and tbh i think they just usd a bit of plastic that had been threaded on to a bit of stainless shaft then turned to make them concentric
the stems now are all likely to be cracking as they do suffer that issue
i'm not sure if i took pics last time i had a shadow 140 apart but i think the starfire stripped similarlyand most of the seals will be the same
i think i made up a few/got the o rings in for shadow and 400's and i think i have trailsman sets for both the bottle and cylinder versions