For $129 I put a Bintel Crayford 10:1 fine focuser on the back of my Skywather 127mm MAK and used it for fine focusing. To use this So roughly move the mirror to focus with the normal focus knob - then never used it again - only use the Crayford focuser.
To do this needed a tube adapter from memory from the USA (tp change teh 48mm back to a 2" back) and a spacer (one simple nylon zip tie).
Now if I could do this with a manual SCT focuser - stands to reason you could put either a motorised standalone or PC controllable fine focuser in its place.
A Moonlight SCT focuser would most likely be great, alternatively you used a normal Crayford SCT focuser (Bintel ~ $130) add a JMI focuser (Bintel ~ $245) then make it PC controlable by adding a Shoestring astronomy FCUSB.
http://www.store.shoestringastronomy...ages/fcusb.jpg
I did this with a C9.25 - first added a 10:1 Starizone fine focuser for improved manual focusing (also reduced mirror shift) then added a Meade motorised Zero shift focuser and ran this through a ShoeString Astronomy USB Focus Controller.
From memory Starizon sold the collar need to change the Skywatcher's rear thread to allow 2" normal Crayford or Meade focusers to be attached. I recall it converted the 48mm rear to a 2" tube
http://starizona.com/acb/M48-to-2-Ad...P3579C109.aspx
Personally I'd advise get the matting collar you need and then use Moonlites High Res Stepper Motor with MoonLite Mini V2 Controller - controlled via ASCOM / PC thru USB port and Virtual Serial Port software.
http://www.focuser.com/cgi-bin/dman....e=motorstepper
I have one of these on a WO FLT 110 and its brilliant! They sell for around US$ 440 plus postage - and are works of art!