Z axis power feed advice sought

[metric_taper]

I purchased the same import unit (Align brand from Harbor Freight) >20 years ago and put it on my Wells-Index mill. It absolutely (I'm age 67) was the right thing to put on the mill.
I did have to make a new shaft to the bevel gear that mates with the lift jack screw on the knee. I also made a mounting stand (I think that's what it's called) that replaced the original dial scale 'tick' mark and bearing access cover for the shaft. I pulled the original one out, I think I used some 3/4" bar stock to copy the original bearing lands and bevel gear pilot and flat for a set-screw (which I thought was odd for the torque needed to hand cranking).
I needed the new shaft for the extended length (I used some 4inch round bar that was 1.25" thick cutoff for the mounting stand), also to make clearance for the cross feed power unit (which is rotated at a 45 degree angle for the fwd/rev feed lever, which I had to shorten). This feed unit needed the table lift to be further out to give that clearance.
At the end of the new longer shaft I put the original crank handle. I do use that for the exercise. But the power feed makes quick work raising up the knee. I keep my 12" rotab with 3jaw chuck stored on the left end of the table, and mostly have the 6" machine vise on the mid right side of the table.
Sorry for the long story. I've not had a single issue with any of these import power feeds. They did a better job at copying Servo brand's mechanism. And they all have the problem of a very small sweet spot of feed control on the potentiometer. There's no feed back even in the Servo brand power feed. Just a PWM SCR (in the table feeds 150inlb, TRIAC in the table feed 250+inlb) simple circuit using the mains frequency as the PWM frequency. Either no movement, to too fast with less then 10degrees of the speed pot angle from slow to fast.
They all use universal brushed motors. And the biggest part of the fwd/rev mechanism is levers with cams to control microswitches, and swaps the electrical ends of the field windings in the circuit.
I don't think you can go wrong.