Replacement hatch nut source

[pcatterall]

The ones with the big black finger nuts.
Don't know where it's gone, they do fall off but how it's climbed out of the 'front bedroom' is beyond me!
Trying to find a replacement but cant locate one, may have to use a big washer and a wing nut.
Any suggestions for a source please?

 

[rob2]

A bit of searching should turn up a similar bracket, but of course there's no guarantee the thread will match so you can use the new nut on the old fastener. If you can identify the thread on the original any machine shop or hobbyist can turn yo up a replacement nut in brass with a knurled grip.

Rob.