Bit of an odd question but does anyone know what type of screw a Naim Lavender DIN5 interconnect should have on the outer metal sleeve? I have one where the screw was lost by previous owner and replaced with a galvanised roundhead pozidrive screw (you would have to go a long way to find something less appropriate. Also, I’d be interested to know if these are a specialised item or something I can pick-up from the hardware store.
Hi, I have just looked at one of the lavender DINs running into the back of my pre. The screw head is definitely slightly domed, and for a flat screwdriver. To my eye, it looks a very non-standard type, probably quite niche. I’m hoping @NeilS can help you.
I don’t know whether it’s a screw that cam be bought off the shelf. However, you could ask your Naim dealer whether they have one rolling around in a spares drawer somewhere.
Just had a look at one - on a Chord Chrysalis, but its the same PREH DIN plug.
Certainly not a standard screw. Recent ones are now a cross-head screw, but the previous ones were slotted. PREH being German made, I would hazard the thread will be Metric.
I think the best bet, as @Richard.Dane suggested, is to see if a dealer has one. Maybe from an otherwise broken plug.
Worst Case. Buy another PREH DIN…
If you got hold of the correct screw, I doubt it would be any use.
There is a very good chance the replacement screw has destroyed the original thread, as it is probably a self tapping screw
If the new screw is stopping the plug from sliding apart it’s working perfectly.
Don’t worry about it.
I’d buy a new plug and swap the guts out.
If it bothered me that much. 
I would imagine that the screws are bespoke, with a machine thread. The old ones had a slotted head & the newer ones have a slotted/T8 hybrid head.
As Fatcat says above, the threads are likely ruined now. Also, if it is a self tapper, it will have a sharp pointy bit right where you don’t want sharp pointy bits! So the usually floating outer part may now be in contact with one of the cable cores.
Regards
Neil.
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I’d get hold of a new lavender cable. Easier 
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That’s what I’d do but the OP only wants a screw Ooer.
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Get hold of any ol’ scrap cable with any ol’ PREH, I have some in my bits box, and rob a screw.