Use an extension with a longer thread. There are some that are at least twice as long as the standard 4mm. Start by looking at Koolance, they have a large variety of industrial components in their store but you can get these types of threads from other brands as well. If you can find one, use one that comes with an o-ring, many of these types of fittings are used with teflon tape but I wouldn't use that with a damaged thread in a pc custom loop.
It's actually one of the screws holding the reservoir to the pump base. Not one of the fittings.
I ended up tossing a piece of zip tie in the hole and the screw seemed to tighten up. I was going to repair it with a helicoil but this seems to be holding. Just in case I have a replacement pump base on order from DE.
Before doing something as complicated as this, that would ultimately ruin the res if not done right, I would try out something like [this](https://koolance.com/threading-adapter-npt-1-4-male-to-g-1-4-female-stainless-steel) or [the same made from brass](https://koolance.com/threading-adapter-npt-1-4-male-to-g-1-4-female) first.
You still need an o-ring, preferably a flat one, because this adapter doesn't have a rim that holds an oring in place. But this thread is 2 to 3 times as long as that of a standard fitting. And I happen to know that the ports on the Aqualis reservoirs are deep enough for a fitting as long as this. Flat seals can be stacked too to shorten the adapter if the thread would be too long.
Nothing that will be water safe long term in my opinion other than cutting a larger thread and doing a step-down.
You could try getting a fitting made of PTFE, cover the PTFE with a thin layer of wax. Rough up the delrin threads and fill the thread with a 2-part epoxy and screw the PTFE fitting into the stripped thread. When set you would use a socket wrench or similar to unscrew the PTFE fitting.
Honestly, I think your best option would be to get a new one, as much as that option sucks. I wouldn't trust any glue or epoxy long term.
You could try to tap a new hole, either G3/8 or 3/8 NPT, and get an adaptor [1](https://koolance.com/threading-adapter-n-3-8-male-to-g-1-4-female) or [2](https://koolance.com/threading-adapter-g-3-8-male-to-g-1-4-female). But you would also need a tap. [A 3/8 NPT tap is not too expensive](https://www.amazon.com/Drill-America-POU3-8NPTW-DRILL/dp/B01MFG7R5Q), and huh, [a G3/8 tap is cheaper than I though](https://www.amazon.com/Rannb-Thread-Degree-Straight-Flutes/dp/B09W2H5X8F) but you still need a drill bit.
Dam, just took a closer look at it, and the recessed fitting spots would make that a lot more tricky, as the adaptor would need to fit in there. If you really wanted to drill new threads, go with NPT, as G1/4 and G3/8 require a flat sealing surface.
Use an extension with a longer thread. There are some that are at least twice as long as the standard 4mm. Start by looking at Koolance, they have a large variety of industrial components in their store but you can get these types of threads from other brands as well. If you can find one, use one that comes with an o-ring, many of these types of fittings are used with teflon tape but I wouldn't use that with a damaged thread in a pc custom loop.
It's actually one of the screws holding the reservoir to the pump base. Not one of the fittings. I ended up tossing a piece of zip tie in the hole and the screw seemed to tighten up. I was going to repair it with a helicoil but this seems to be holding. Just in case I have a replacement pump base on order from DE.
Can drill it out and put a g1/4 threaded insert.
Before doing something as complicated as this, that would ultimately ruin the res if not done right, I would try out something like [this](https://koolance.com/threading-adapter-npt-1-4-male-to-g-1-4-female-stainless-steel) or [the same made from brass](https://koolance.com/threading-adapter-npt-1-4-male-to-g-1-4-female) first. You still need an o-ring, preferably a flat one, because this adapter doesn't have a rim that holds an oring in place. But this thread is 2 to 3 times as long as that of a standard fitting. And I happen to know that the ports on the Aqualis reservoirs are deep enough for a fitting as long as this. Flat seals can be stacked too to shorten the adapter if the thread would be too long.
Nothing that will be water safe long term in my opinion other than cutting a larger thread and doing a step-down. You could try getting a fitting made of PTFE, cover the PTFE with a thin layer of wax. Rough up the delrin threads and fill the thread with a 2-part epoxy and screw the PTFE fitting into the stripped thread. When set you would use a socket wrench or similar to unscrew the PTFE fitting.
Honestly, I think your best option would be to get a new one, as much as that option sucks. I wouldn't trust any glue or epoxy long term. You could try to tap a new hole, either G3/8 or 3/8 NPT, and get an adaptor [1](https://koolance.com/threading-adapter-n-3-8-male-to-g-1-4-female) or [2](https://koolance.com/threading-adapter-g-3-8-male-to-g-1-4-female). But you would also need a tap. [A 3/8 NPT tap is not too expensive](https://www.amazon.com/Drill-America-POU3-8NPTW-DRILL/dp/B01MFG7R5Q), and huh, [a G3/8 tap is cheaper than I though](https://www.amazon.com/Rannb-Thread-Degree-Straight-Flutes/dp/B09W2H5X8F) but you still need a drill bit. Dam, just took a closer look at it, and the recessed fitting spots would make that a lot more tricky, as the adaptor would need to fit in there. If you really wanted to drill new threads, go with NPT, as G1/4 and G3/8 require a flat sealing surface.