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Drilled out (welch?) plug in carb?

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TimS-Orby:
Hi All,
I'm still tinkering away on my CB500k2. I'm about to swap out the US bars for the lower European type, to deal with the short cable issue we spoke about a while ago. I'm pretty sure I'll prefer the lower bars too.
However, this is about somethin' else!
I got a 'bargain' on good old Ebay. A complete carb assembly for my bike. I thought it was worth having a spare assembly in stock, especially as the inlets on my carbs are pretty chewed up.
All seemed well until i opened the float bowls. As per the photo below, it seems someone has drilled out on of the (welch?) brass plugs in one of the carbs, and replaced it with a screw! Yeah! Looks like they had a good old go at the other one in there too.
Hmm... does this render this carb useless? Can the plug be replaced? Will this foreign body actually work?

Other than that everything else with the carbs seems potentially good, and they are in much better shape than those currently on the bike, with that one exception!
Any advice much appreciated.
Regards,
Tim.

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taysidedragon:
I would be concerned about how long that screw is. Does it crush or interfere with the jet underneath? Some investigation required.

TimS-Orby:
AFAIK there is no jet under there. From what I've read these plugs cap the end of airway drillings creating the internal passageways, drilled during manufacture. Although I may be wrong.
I've carefully removed the screw and the threaded parts has been cut down to around 4mm. Looks like the hole has been properly tapped, so that's something. I'm wondering about replacing the screw with a set screw, with maybe a spot of JB weld over the head of it just for good measure.
Not sure if that's a viable solution.
I suppose I should see how things look after a thorough clean and blow-out.
T
Edit: Perhaps I misunderstood... No, it's not interfering with the lower part of the pilot jet there.

taysidedragon:
If the screw is not interfering with the jet or the float movement you could put it back in or use a short grub screw. Use some threadlock to stop it coming out.

Bryanj:
I agree, as long as it seals and interfeers with nothing its fine

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