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Good heavens! I stopped in for an update, looked at the posts up top of the previous page and nearly fainted! What wonderful work!
Well, if you're going to get into the shoulda-woulda-couldas... Then you shoulda made that access plate shown in the last picture removeable instead of printing it and the rest of the fitting as one part. Then you woulda had a spot where you coulda reached all the cap screws with a ball-end hex wrench. 20/20 hindsight is a wonderful thing isn't it? Glad it's you and the elves instead of me putting this thing together. Who's gonna write the service manual for this pump?Don
Chris, methinks you need to get a thin, ratcheting insert driver like this...https://www.amazon.com/Neiko-03044A-Ratcheting-Screwdriver-Close-Quarters/dp/B000XYOUS6/ref=sr_1_31?dchild=1&keywords=thin+ratcheting+hex+driver&qid=1621616082&sr=8-31My version, which came with my Chapman gun screwdriver set, is only 7/16" thick at its thickest point. With a slightly abbreviated hex bit, I could slip it into a slot about 1/2" wide.These type drivers work in both directions although many don't have a reversing switch; you flip it over to drive in the opposite direction.Not applicable to your current task but perhaps useful to remember for future jobs is the fact that many of the 4mm driver sets come with a flexible driver extension, e.g....https://www.amazon.com/ORIA-Precision-Screwdriver-Extension-Smartphone/dp/B07RDHLL9H/ref=sr_1_13?dchild=1&keywords=4mm+driver+set&qid=1621616877&sr=8-13
Outstanding progress Chris! and a recommendation for screaming while going downhill too! Hard to beat that on any other hobby forum!
You might be able to connect your hex stub to your ratchet with a length of soft plastic tubing, like Tygon. That would allow you to turn it from an offset or angled position. A kluge-master's u-joint for low torque applications. Final tightening might need another idea.