Well if it's working now i suggest you solder the ends, with a soldering iron and some extra solder, while you hold it in place with a pair of tweezers. The heat may melt the adhesive.
If you did not solder it, you are in for trouble! 
Totally agree, asking for it in fact !
Maybe you could reverse the process which led to the diode unsoldering itself. Turn the Nano over so the diode is now on the top side, power the Nano together with the load which caused the overheating event, wait until the solder has again melted, then remove the power.
Now that the diode is glued, it will not act as a melt fuse to protect the circuit or power supply...
Pretty sure that the glue will melt at higher temperatures unless it's epoxy-glue.
but that sounds kinda... dangerous
That appears to be the "thrill of the chase" here. 
Initially yes, but you would soon get the hang of it.
Duct Tape would have been better.
Just use the soldering iron and a bit of tin
anyways, thank you all 
Hi,
Did you measure the component with a DMM to see if it was a diode or a slow blow fuse?
Thanks.. Tom.. 
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