I think the only advantage to the MP kit was a few more keys and additional springs, which they didn't give you a rate for. You don't even really need the keys, drill bits will work in a pinch:
14° = .130” or 3.3mm or #30 drill
16° = .149” or #25 drill
18° = .167” or #19 drill
20° = .184” or #13 drill
22° = .202” or #7 drill
24° = .225” or 5.7mm or #1 drill
26° = .240” or 6.1mm or B drill
28° = .260” or 6.6 mm or G drill
Same keys, but couple more of springs... colored green as far I recall. I have the MP kit and the MP branded instructions got a decal over the instructions sheet adding these on the spring list. Can't recall if the curve graphic for these is an added sheet. I have not seen my MP kit in around 8 years.
