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Ugh, bought over 40 TRV's as part of my heating upgrade and all fit pretty much like this. I know I am not the first guy to update 100 year old radiator valves so there must be a way. This even has my 20 year experience European plumber stumped. Valve on left is balancing valve and the right is Tunstall trv. Both are off, not due to the manufacturer, just bad luck. We tried pulling up riser, no play. Our supplier was at a loss too. I felt physically ill when I saw this, someone must have an answer with all the wisdom on this forum.