Tribars have damaged handlebars

Yup, think I would probably have made the same mistake. Seems like an odd design unless these ones just had longer screws than normal?

I guess that that is the clamp that is used to tighten the actual extensions into the bracket...in which case you may need to cut the bolt down a tiny bit or scrap the bars, I wouldn't ride with them if they tighten into the bars.

BTW without wanting to be too judgemental, if you can do that when fitting elbow pads, I would recommend you buy a torque wrench before you do any more work on your bike.

Agree that you shouldn't ride those bars, I'm far from uptight about scratches and dents and their impact on structural integrity, but that looks nasty.

What make and model are the tri bars, so that others can wartch out for this possibility and avoid it?

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Odd design of tribar for the bolts to go through like that. My set (Vision) have put a few surface scratches from metal on metal, and the elbow pads have the tendency to rip the bar tape, which is easily replaceable. The elbow pads screws don't go near to the surface of the bars as they are raised. Even if I removed the raisers, the bars have no holes for the screws from the elbow pad section to come through and contact with the bike bars. Personally, I'd replace the drop bars and get a different set of tribars, which tend to need to be secured tightly in my experience to prevent slipping down if you happen to force down on them. Might happen again otherwise.

*user that over tightens tribars damages handlebars.
FTFY
Don't ride that unless you want to have a closeup meeting with the tarmac....