Hi Francis X,
There are a few threads on the forum addressing the problem with loose sections and threadings (a quick search using the
Search Tab on the menu bar above may help find you answers -
use the search it is our friend!). I don't know if any other members have tried this but you might be able to use PTFE tape (also known as Plumber's Tape for sealing water pipe threads. It is like a silicon tape you wind round the threaded part of the pipe. After a few layers have been wrapped you then screw the nut, pipe or in this case the grenade section on. The tape is non-permanent and should any stick out above the joint, it can be carefully trimmed.
Later if or when you need to access the internals the parts can still be unscrewed and the tape removed without leaving a residue (in case you want to sell the parts, ect). Then to reassemble just repeat the process and wrap a few layers of tape. This should stop any wobbles.
Hope this is of help, and there are videos on YouTube showing the correct way to apply the tape (
Here is one I found)
kind regards,
For Tyeth