Table support for O'Day 30

[Romario]

In my O'Day 30 I have a cabin table like this -

it goes down when we sleep and up to become a table

here is the up position:

On the second photo you could see there is a screw that keeps the table up.
The upper tube of the table has a groove like this:

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and inside it had a part with threads that would keep the table up when screwed. It corroded and has no threads now, so we can't keep the table up. Is there a place somewhere where I could find a similar part?

The part looks like this

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and there is a hole with threads in the middle, so it basically pulls one tube to another.

 

[DeniseO30]

It's was made by garelick..Kind of a sliding dovetail piece that wedges the slot rather then the bolt just working like a set screw. you could get someone to make it . Seems they don't make it anymore http://garelick.com/prodcat.php?subid=EB07