"Sync" is a relative term...
The MK Cobra setups use a ~higher speed but very low torque feed motor on the spool end, and a ~std feed in the gun.
It only pushes as fast as the wire as being pulled, due to the limited torque.
The "trick" was designing a motor that would not burn up when "stalled".
I've been playing with the idea of a DIY push-pull setup, and have come up with a setup that SHOULD work.
One method of torque limiting that works VERY well and is ~cheap is one type of sealed slipper clutches available for RC cars.
It's basically a plastic torque converter filled with a thick silicone goo, maybe $1 worth of parts, dust sealed and capable of taking ridiculous abuse compared to life in a welder.
(The bits cost a LOT more at a hobby shop, I'm referring to manufacturing cost)
It would allow you to adapt a std feeder to push as long as it ran faster than the one in the gun, is easily adjustable, and VERY consistent.
I've been out of that hobby for awhile, but they were pretty common at one point..
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