I hope this is appropriate to this thread.
I recently had the tube on my grand upgraded by Robert when I sent in for a button issue. However when I went to fill my bottle, the tube pulled of the brass nipple. I have figured out how to maintain pressure on the tube to help keep it from slipping off but wondered if these are typically glued on with the newer design. I only ask because a newly purchased grand has no issue with tubing slippage. Any advise would be appreciated. I'm hesitant to use super-glue without permission.