@UncleFred, I did print out a prototype and test it – it fits perfectly into the pump and is a tight fit on the valve as well. I messed up on the pins by heating the whole adapter at once with a hair dryer, which caused a couple of the holes to close up. This messed up the insertion of the rest of the pins. See photos.
I fixed the design to have larger holes. Additionally, I’ll be heating the pins with a soldering iron and inserting them one by one.
I don’t have a 3d printer myself – I’m using a friend’s. These things are inexpensive to print. If you look around in your closest city you’re almost certain to find a 3d print shop – some universities also have them, so if you have contacts with people and ask around you should be able to do this.
That’s the reason the design is public – I’d like anyone to have access. Printing it locally definitely beats all other methods. In the worst case, I think there are online 3d print services that allow you to do the same thing anyway – you just have to submit this file to them I think.
