Thank you for the input guys.
Exsfo,
I thought I'd try the original vendour first, again, very helpful bunch, but given the cost of return post will certainly now check your guy out!
Tandum,
While I've had previous success collimating doublets, and even a Brandon triplet, there are no obvious "fiddle-points" with the 120.
Also, mucking about (my skill level
) with the scope may void the warranty.
I've got a laser collimator but the super-fine adjustments needed to achieve perfect collimation are a bit out of my league.
In addition, though everyone who's looked thru' it has proclaimed "Out of Collimation", I still want to be sure ther are no actual errors in the lens group construction.
Also, for $4000 +, one would expect it to do what it says on the tin!.
Thanks again. Your advice has been very helpful and I'll try to make the most of it!
Peter