Fundamentally, it was parts availability and reliability. There was a lot of stuff available in 24V that was a direct swap for many of the 24V parts. There was very little 12V stuff available.

These days, its a bit of a toss up – 24V stuff has largely been used up, so in some cases it may just be as easy to go back to 12V!

AR501 was on 12V up until its rebuild. I dont know what their plans are now.

Bruce