Yeah, an insert could do it. Whats a "meat insert " . . hey I know you guys eat more steak than us . . but .. nah . can't be . .

The ¼" still permeates the camera industry for the tripod thingy .. .

Thanks Tom,

Grazie

The most common name here is "Helicoil insert" I have vast experience installing these in my Chevy Corvette L-88 big block aluminum heads in the spark plug holes, valvle cover holes, intake and exhaust manifild holes, and they were already installed in the rocker stud holes and if you had the aluminum block in the crank main bearing holes.

JJK

Thank you JJKizak - now I know WHAT they are called I've found dozens of suppliers here in the UK for th "Helicoil insert" . .excellent!

Grazie

I'd be very careful using those into plastic, I think they rely on exerting a large force against what they're inside of to hold in place.
There's another thing that's made of brass with the appropriate thread inside and well what looks like a pineapple on the outside designed to bite into the plastic.
You might be able to get a thingy with 1/4" female on the bottom and a 6mm male on the top ( no sexist jokes OK). I'm certain someone like Manfrotto makes them, for a bit more you might find one with a gimball type arrangement in the middle so you can angle the monitor.

The Helicoil comes in a small kit that contains a drill bit, insert tool, tap,
and the helicoil insert. There is a pressure as the coil is threaded into the new hole. You must be vary carefull not to "sloppy drill" the new hole as the helicoil will not lock in place properly after insertion. If you have nervous hands and don't know what parralax is have somebody else do it.

JJK