It was the hardwood style.
I havenât used those on a build yet but have definitely experienced that wood bulge with them on furniture projects
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I use the ezlok 5m 10mm flanged. Soft wood inserts. I have had some fuck ups but for the most part they work. I and drilling the holes a bit larger now and put super glue gel in before screwing them in. My biggest issue was cracking them before getting them seated all the way. So I went to larger hole to start with.
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This link is broken for me. These are what I ordered
And I put JB Weld 8265-S original formula on the threads
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I use these. https://m.grainger.com/mobile/product/GRAINGER-APPROVED-3-8-Brass-Slotted-Drive-Knife-4ZU69?cm_sp=Home-
I still use epoxy, but good luck getting out regardless.
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The ez-lok inserts work great IF you get them to work.
Iâve seen two failure modes. One is if the hole is slightly too small then it will pull up the top layers of ply and leave a mangled mess.
The second is if your installation torque is too high (meaning you need a bigger hole) the installation tool will strip the slots out. The brass they use is very brittle, it has something having to do with no lead and machinability.
Iâve never stripped the threads out though. Theyâre beefy, thick walled, and have well formed threads.
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If you get the E-Z lock kit it comes with the drill bit you need.
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Probably more expensive but this is the matching one for the ones I use. We order through grainger where I work.
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These are M4 brass threaded inserts for use with the tool that @mmaner mentioned. However, i donât use the tool. I made my own tool.
This is a video. They used to display the play icon here but i guess they got retarded. click to view it on insta.
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Iâm using EZLock, failed at first try, using a hand drill and destroy the top of the insert half way in. I continue with just using some screw that shorter than the insert and screw them in gently, it works.
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Was looking at some threaded inserts, do these look good? the outside threads seem a bit small to grip well but Iâm not sure.
i would use at least M4.
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You use the m3 ones? Was looking for something for my trampa board and you guys have this handy thread here! Thanks 
As for screws that go into the inserts, I was thinking to choose ones that are ~3mm longer than the inserts to account for enclosure and gasket and countersunk washer thickness. Seem about right?
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Exact ones I use.
Yeah m3 x 6mm.
No other way to know except trying. I ended up using 10mm but depends if you use padding in between.
Mine goes
screw - spring washer - regular washer - enclosure - 1mm foam - insert
Total of 24 screws.
I used m3 as opposed to a larger size because I wanted to take out as little plastic as possible from the enclosure but who knows. probably doesnât matter.
Also I drilled m4 holes into the enclosure. You would have to be some kind of alignment wizard to be able to use m3 holes in the enclosure and align them perfectly to 20+ m3 inserts. m4 would give a slight leeway.
Be interesting to hear other peoples thoughts.
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I use the self tapping SS hard wood inserts and they dont come out very easily. I dont reccomend epoxing them to the deck because if you strip one then you are SOL. I have stripped one and if i used epoxy it would had been a nightmare.
Could you fill with epoxy, drill it out and tap a thread into epoxy?
You could, but epoxy is WAY less strong than metal, and also less wear resistant, so thatâs a rather terrible idea overall.
Using epoxy to repair a hole for a metal thread insert, maybe. But I certainly wouldnât trust fasteners threaded straight into an epoxy hole.
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