I haven't been posting as frequently over here because I've been teaching myself to do leatherwork so I've been spending most of my time on the Leatherworker.net forum.
There's been some recent development on a new upgrade for the digital servo motors. The one on my Highlead has a knob for adjusting speed, but the digital ones have an L.E.D. readout with touch buttons to move up or down in speed.
They also have a laser beam inside that is used to control the speed of sewing when you press on your foot pedal. It seems that they were VERY sensitive with very little travel in the pedal to go from stop to wide a$$ open!
If anyone has one of these new motors, it's worth the time to check out this thread and video about the upgrade/modification.
I just got a new Cobra Class 4 yesterday and the speed control is absolutely FANTASTIC! 8)
Here's the links to the thread and video:
http://leatherworker.net/forum/index.php?showtopic=41483&st=0&p=258131&hl=+servo%20+motor&fromsearch=1&#entry258131
http://leatherworker.net/forum/index.php?showtopic=41916&st=0&p=260742&hl=+servo%20+motor&fromsearch=1&#entry260742
Video:
http://www.swflholsters.com/358/sewing-servo-motor-diy-smoother-speed-control-mod-paper-gradient/
I hope this helps if you have one of the new digital brushless servos. Mine is working soooo good, I may buy one for my Highlead....and I'm not having any problems with it!