TR12x3 description inconsistency

[elenhinan]

I'm considering buying some spindles, but I'm a bit confused regarding the description of the multi-start spindles. The one I'm considering is the TR12-6P3 spindle:
http://www.worldofcnc.com/products.asp?recnumber=195

I've read through the following page to make sure I don't mix up pitch, starts and lead. But I feel the difference vendors do mix these up, making it difficult to know what will fit.
http://www.cncroutersource.com/acme-lead-screw.html

As the single-start spindle (TR12x3) has 3mm pitch, I thought TR12-6P3 was a 3mm pitch as well and with 2 starts, making it move 6mm per revolution (6mm lead). In the http://www.worldofcnc.com/images/multistarttrap.pdf file that the page at worldofcnc links to it says "Part number "P" indicates the number of starts. Ie P3 = 3 starts." and this would make it 2mm pitch I guess.

However, this ebay seller uses the same description, TR12x6-P3 but states it's start 2, with 6mm per revolution (lead), but goes on saying it's 6mm pitch (which doesn't make sense):
http://cgi.ebay.co.uk/2-START-TR12x6...-/220641659836

So what I really want to know is: Is this a start 2 or start 3 spindle, and what is the lead and pitch? And will it fit these nuts: http://www.dumpstercnc.com/trapezoidal_12x3x2.html ? To make matters worse, DumpsterCNC it says 3mm lead start 2, which would mean 1.5mm pitch which I doubt it is.
edit: Got a (fast) response from dumpstercnc, and the description is now fixed so it says 3mm pitch.

Right now I consider going for TR12x3 single start just to be sure. I'm in the planning stage of a simple DIY cnc, so I'm not locked to start 2 in any way. I'll attach an image just to give you an idea, the xyz axis rails are 800mm x 500mm x 300mm, and hopefully I can cut some wood and plastics with it.