Carefully cut a hole in the bottom of the Tin for the USB connector, be careful of sharp edges!
A good utility knife works well for this. Go slowly and take your time so you don't take off part of your finger. This was my first pass at it, and I'm not real happy with the rough edges, further expiermenting is in order.



Insert the connector and use a little hot glue to keep it in place. Hot glue is very forgiving so if you mess up its easy enough to remove and redo! I would usually do this from the inside, but there isn't enough room with this one. I may try a rubber "O" ring here on the outside to prevent the USB connector from sliding in, it would be a cleaner look.