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Not sure I'd go the glue gun route - that's where your hands rest on the hoods so any bump would be noticeable.
If you're trying to bodge it I'd probably try adding some plumber's tape to the screw to give it a snug fit as you place it in the bleed port, then wrap over the top of the screw and around the lever body with electrical tape to get a good seal. When you tape the bars it should be covered so you won't notice it
My inspiration in picture form - having just seen an obviously crash damaged lever go on eBay for £143!!
Turns out you can't swap out the levers on these, so lucky escape there. But im 100% throwing mine on eBay when i can track down a spare... mugs.
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