You MIGHT also find that this:
http://www.findmall.com/read.php?86,2019201,2019201#msg-2019201
is a problem that you may need to address in the earlier versions.
It only seems to be a problem in some and here's the part , that helps with the solution
http://www.findmall.com/read.php?86,2019201,2040820#msg-2040820
After reading this at the time and checking to see if I had the same problem, which I did, I contacted Minelab who offered to install them for me if I sent the control box handle in, but I requested them to send me these rubbers, which they were happy to do and I to installed them myself.
It's easy enough to do, so long as you do so carefully as your dealing with unscrewing the control box body , that is plastic and you don't want to over torsion or reinstall the self taper screws so that they create a new thread, when you should be able to re engage the original(maybe it's fanatical care on my part, but self taper metal screws into plastic or metal eve, is not as forgiving if you aren't careful with it when re-assembling).
Use a manual had driver for the screws and feel the placement of the thread and torsion with your hand, instead of an electric screwdriver.
David Di