Epoxy would certainly work but my concern is how tight the tolerances are on this---reassembly is a very tight fit and I think bending the aluminum channel "open" then clamping it closed could introduce other variables that might effect the flatness of the dark slide (which is why I hoped Duco cement would have been suitable for the task) I'll go to the hardware store today and see what epoxies would be thin enough to apply and then tap the channel into place.
Thanks all!
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