Just to be clear guys the outer camlocks can be changed and fix the issue of wobble as noted successfully by numerous members over time. What I was refering to is 2 inner parts that require replacement that can cause a more pronounced wobble when they have exceeded the internal tolerance. When replaced the shaft returns to as new positioning when locked in place in both the extended and retracted position with no lateral movement.
As I wasnt observing the changeover I couldnt say with certainty that the shaft required to be disassembled to enable replacement, the explanation they (Miners Den) gave me both at the presentation and later the collection of the machine/s lead me to believe this was required.
Perhaps an enquiry to them might be in order, Ive certainly found them very helpful and transparent in their dealings with any of the Minelab range over a number of years, although I have brought several new machines and referred sales to them which may have influenced their dealings with me personally.