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The Boa Base bit has partially come off my Diadora shoes.. anyone had any success gluing these back on (and if so, which glue did you use?)?
The plastic part where it was stitched has snapped, but there looks to be a fair bit of surface area that I can glue down.
Have got some ShoeGoo, and if that fails then epoxy? Or any other suggestions? Thanks in advance

Epoxy would my choice for such a repair. Hold it in place with a small G-Clamp if you have one.
Thanks guys.. yeah my concern is that it might not stick as I know epoxy won't stick to the shiny side of duct tape..
This is the epoxy I've got BTW https://www.amazon.co.uk/Gorilla-Glue-25ml-Epoxy/dp/B009NQQJFC/
Think I'll try keying it up, ShoeGoo, clamp and see how it holds.. shoegoo should be the easiest of the two to remove if it doesn't stick.
Failing that maybe put some stitches or a staple or something in so the glue has something to grip to?
Gorilla glue is pretty impressive. The yellow stuff is non-flexible but would stick that easily. try and sand the surface if you can
Cobblers use contact adhesive, as its the glue they use to assemble shoes/boots when they are being made in the factory.
Get in touch with Boa. You can buy the dials as a service item, but not the bases. One of mine broke on my Bont road shoe in a similar way. Boa were fantastic when I politely asked if I could buy a spare base directly. They worked out from pictures and dimensions which base I needed and posted a pair out to me without charge. The base came without holes to sow through, but it was easy enough to mark up from the needle holes in the shoe and drill, then sow in. I think glue would struggle to bond for a lasting repair. Good luck whichever route you choose. I can't speak highly enough of Boa's customer support though!