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Hammerite 41150, if you can find it

Yup

Grab your DMM Check the D100 diode, both sides Then check then output of the charge pump I would also suspect any caps not rated for 18v+

Coupe check at R12 as well. If there is DC present, I would suspect C8 has some leakage.

If you can't squeeze a probe between the diode and PCB(can't tell if the are fully flush from the photo), yeah. It would probably be present on the SI diodes as well, unless there's a solder bridge localized to the LED. Could also check at the switch lug. And as always , dont shock yourself. Not...

Is there DC present on them?

Page 7

Ah. Gotcha. They're a little less painful at cabintech than the other usual suspects Check out the anamorph as well. Brian's own design. A kind of DMM DM-2 hybrid I believe.

Check page 3 here See if that helps

Datasheet is first stop. There's not a universal pinout... There are some common pinout among form factors though. Do you have a rotary in mind?

Paul. Not sure of your building experience but will warn in the event that it's near the "feet wet" category--a DMM is a pretty demanding build. Madbean's docs are top notch(best in the business when it comes to complex builds imo) and help a lot, but it is still a big time undertaking. Not a...

Need one of these

1N4001-1N4007 all have the same Vf. They carry in max reverse and peak voltage. But in an audio circuit, they'll all clip at the same level. Pull the sockets and use what you got.

Somewhat the nature of stacking drives Short the input to ground with the lid/bottom plate on and see if it's still as loud.

Inspect between the charge pump socket and PCB. You may have two blobs that just barely touch. Tip-uee your phone camera

This is why Vampliers/Neji Saurus exist.

Resist the temptation to pickup the pedal after soldering the last lug and give it a few test switches. Eid that once and immediately slapped myself in the forehead. All that plastic is still soft. Take care not to have even partial pressure on the switch when soldering and give plenty of time...

Is C7 the correct value?

Wera J bits https://products.wera.de/en/bits_holders_adaptors_and_sets_the_range_of_bits_bits_for_phillips_screws_851_4_j.html.html