What is the slot for if you are using a tool to put it in from the other way?
@anon54720240 some things, not all things.
The slot cuts thread into the timber as you install the insert.
Donāt need a special tool to install them. I just used a shorter m4 screw to install them on my deck. Drove them in with an Allen key.
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Im definitely using those on my next under board enclosure.
@BillGordon can we get this thread merged with this one?
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The inserts I used were shit. I used the brass inserts with the coarse thread and the hex drive. Every single one broke on the way in. I had to grind the top off all of them 
I will be using the ones @mmaner suggested above for future builds, just ordered 100 of them.
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Biggest reason why inserts stop before flush, the hole isnt being drilled big enough to accept the insert.
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You are likely right. But the inserts are still shit. The hole was less than 1mm smaller than the largest part of the thread and much bigger than the core.
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Fair enough. Ive had a few inserts that just werent made for what we do with them.
For you next insert build, if the first insert has issues going in, go 1/64-1/32 bigger on your bit and continue.
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Good advice 
im just stubborn at times
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Check out my post at the top of this thread.
Tldr if the slotted end tapers/angles in, itās for cutting grooves. If the slot end is straight, itās for a tool.
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@mmaner What size drill bit do you recommend for these M4 inserts? My drill uses a specific type of bit with a cutout like this so I need to find the right one. 
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I can measure it when I get home, but typically 1/16 less than the insert diameter.
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Where did you get these pink washers [?] from?
50PCS M4 Cone Washer Aluminum Alloy Cone Cup Head Screw Gasket Conical Fender Washer (Purple) https://www.amazon.com/dp/B07CQ4J4V8/ref=cm_sw_r_other_apa_i_p1uaEbZ02ACHX
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Fantastic! Thanks a lot!
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In practice, how long of a insert can you use? Like can I get a 10mm insert to be flush on the bottom without breaking through a 7 ply deck?
I always use calipers to measure the deck thickness and make sure the insert isnāt too long.
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But is there a tolerance at the end like 2mm of wood and 1mm of airgap so you donāt notice anything on the far side?
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Oh yeah, definitely. Iād say 2mm is safe as long as youāre predrilling the right sized hole.
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I struggle with this. Drill bits have a tapered head. And decks are curved. So what I think will fit easily doesnāt always fit. Or I poke through the grip tape a bit when I drill. Next build Iām gonna grind 2mm off the inserts to make sure thereās enough clearance.
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I typically use either 8mm for 9ply and 10mm for everything else. The stainless Aliexpress inserts are 8mm. The E-Z Lock inserts are .0375 in or 9.5mm.
https://www.amazon.com/dp/B002WC8TQQ/ref=cm_sw_r_tw_dp_U_x_9FfnEbB4TSTHC
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