Be careful, the heatsink is connected to GND on 7812 but not in 7912 (EDIT: it’s the input there, see below), so if the heatsinks touch, you might need to make a new post here 
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Ah, on the photo above they seem to be barely touching. In the last photo you show is a clear gap between those…
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This is what I am talking about. No idea why the heatsinks slide around, but that might be another issue 
I looked up the connection, in 79XX, the metal lip is connected to INPUT, where:
…and GND for 78XX:
So you’d definitely want to secure your heatsinks and leave a gap between those to avoid a short. That happens quickly if they are allowed to touch and scratch each other which can result in damaging of the heatsinks’ coating (if present at all).
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I was attempting to make a joke after changing it.
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Ok now I get it… 
(20 chars threshold)
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man… knock on wood… but ive never actually blown a cap like that lolol
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I haven’t done this yet, I expect I’ll need a long lie down and some sedatives when it eventually does happen
Today I learned that guitar pedals have the +9V on the outside of the jack and that this can lead to shorts when you got a metal power socket, metal input output jacks and also a metal enclosure -.-
But really, why did they make it that way??
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Not all pedals are the same (some are the opposite), but one simple thing I always do is plug the pedal before plugging in the power
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Any idea how I can isolate the power socket from the case?
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Make a hole bigger than the socket nut, glue some plastic strip on the inside, make a hole for the socket in the plastic (before gluing it is even better…), screw everything together again…
Just be sure the hole is big enough so you can screw the nut and it can’t make contact with the metal enclosure.
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There’s a reason negative tip is used, Aaron Lanterman talks about it here:
Cheers
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luckily i realized my error regarding the connector to the PSU long before anything was set in stone.
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I knew this but still managed to fry an LM386 distortion I made in an altoids tin, I insulated it with electrical tape but not well enough I guess. I ended up replacing the burned chip and LED then switching it back to battery power.
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I put together the Safety Valve the other day (an incredibly simple module to build). A few smoldering resistors later I realized I had four of the wrong tube. 
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I’m sure it’s to help Korg sell more volca’s… 
(not from experience)