I've owned the Lunt LS50THa for 3 years. During that time I really struggled with the helical focuser supplied with it. While this lower end focuser kept the price down at the time of purchase, which was a real plus, the difficulty it caused in obtaining and maintaining focus was a real disappointment for what is a considerable investment.
I own 3 Moonlite focusers for varous scopes now.
Each is of the absolute highest quality but this addition to the Lunt LS50THa is of exceptional value, build quality and performance.
The smooth operation of the dual speed focuser means that the image is no longer whanging around the view like demented pinball when fine focusing!
This is the main reason for my 5 star rating - it is extremely smooth in operation.
The second reason for my 5 star rating is the ease of installation - the machining on the Moonlite focuser is extremely precise - BUT - this means that you must be very careful when mating it to the telescope!
Experience the slightest resistance while turning it into the threads, and I mean any whiff of resistance, and you MUST stop turning. You've got it wrong! When correctly threaded the focuser glides into place with complete ease.
If you've had the 50 for long then it is definitely time to ditch the helical focuser and install this very reasonably priced alternative.
It will be like having a new scope!
Of course FLO's service was 5 star as normal.

I had read lots of reports about changing the focuser on my Lunt. I bought this a number of months ago and it just pulls so much detail, working effortlessly through the spot on engineering. The easy fitting and use has just totally change this scope.