Yeah I completely understand what you’re saying. I rebuilt a few intrax units with the same adjuster process. It is a very Labour intensive process, it’s what we had to do though to guarantee matched performance.
i wish you the best of luck and due to the fact there is no financial cost to how long you take, I say take your time. I can’t say enough times, clean, clean, clean everything over and over. Make sure you have zero dirt in any areas. Use thread lock on the piston lock nut and maybe a centre punch to lock it on.
when you are gripping the rod, make sure you use an aluminium or plastic clamp so no damage is caused to the rod. If there are any positives on the rod, your seals will get torn when you slide them over. Don’t try and repair any rod damage, get a new rod machined. If the rods are slightly bent, replace them. A bent rod will cause premature wear on seals. Your units are remote gas cans too. Gas will find the slightest of gaps to escape from.

good luck and take your time.