Epoxy glue
Epoxy 2 part RAPID glue. Best glue to assamble your paddle.
This EPOXY glue is strong and bonds better than HOT glue sticks.
With this glue you reduce the chance of blades come loose, and worse, blades stubs or shafts to break.
In case you need to take out the blades from the shaft you can carefully heat up the shaft blade area and after few minutes take out the blade. ( not, READ more about how to do it SAFE with damaging the blades / shaft )