Trailer hitch with functioning handle

A functioning hitch that fit and locks onto a 6mm ball.
Designed for a trailer I'm designing/building based on the Offroad trailer by @FarmersMark
I use a m3x20 to attach it to the trailer and a piece of 1,75mm filament to hold the handle in place inside the hitch.
It is supposed to be very tight to get a little binding effect so the handle will stay closed even in rough terain

I will leave a link for my trailer here once I'm done.