[Delphinus]

Thanks for the info, very helpful.

The solenoid itself is already a replacement, or rather, a rebuild based on a solenoid I bought off ebay because the original froze on (it was a decade old). I had hoped I could unfreeze the original but I couldn't (and it turns out you can't lube these? So I guess when they're done, they're done). Between that and the number of options of feed pumps I've gone through (tried a peristaltic pump but the gears wore out after a couple months), then some other pumps that eventually weakened ... etc ... I feel that "eventual failure of parts" is a sort of given in this hobby.

Just wanted to be sure I wasn't in the territory of "Wow! That's a really burdensome way to dial in your reactor, there's an obvious better way that you're overlooking".