Ok, here it is. So, the basics are the same: hubs need machining down to accomodate different ABS tone rings, but that is about it. Everything else can be done at home using a drill, tap and dremel!
Comparison of both solutions: the old with recess of about 2 mm for the sensor to sit in
The newer one which doesn't need that (big) recess
Instead of enlarging the opening of tone ring to match that of focus', you just put the ring on top covering the dust shield for the bearings as well
This is extremely important: make your tool for pressing the ring on. It is very simple
I just had it machined with ID of 68,3 mm
If you bend just one notch, the ABS will work erradically
Closeup of a ring
In order to be able to slide the hubs onto the spindles, I had to take away the rubber seal at the bottom (that is the downside of this method)
Using the hubs from the drums I made this tool for the exact positioning of the sensor. On my first attempt one of my sensors was off by 1 mm (radially) and the ABS would pass self test but at slowing down would kick in and grind. The positioning of the sensor is extremely important try not to improvise there!
This tools enables you to put the sensor on the right (I guess you'd call it nearside) wheel to the other side of spindle. If you do it like that, then you can keep the angled sensors and put on the spacers if you like!
You just turn the tool the other way around and you have the exact position for the RW
I guess you all know what this is. I don't know the name in English, we call them spies (why don't ask me). 0,6 mm is the one we are after!
At the start you will have a gap of about 1,5 mm so you will have to take about 0,9 mm of material
Of course, I have to admit I had a spare rear wheel ABS sensor (thanks to Pumanoob, thanks a million, mate!) what enabled me to measure everything on the table instead of lying under the car!
Then used a dremel and started to hone down the hub where sensor is going to sit. Regulary checked the gap to the ring using 'a spy 60' until have reached the desired thickness of material. Drilled a hole, tapped it (you need a 5 mm drill and M6 tap) and that was it.
The exact and same gap on both sides is important for the ABS to operate correctly; it can tolerate some differences, but it will operate unnecessary if gap is not exactly 0,6 mm.