More directly to the matter - here is the part number.
For those interested, check this web site and put in search phase "cable
puller/hoist" and then select the wire rope version.
http://www.mcmaster.com/
I tried copying the page from the web site, but towertalk reflector would
not allow.
p/n 33615T15
Wire Rope Worm-Gear Puller/Hoist 1500 lb Cap, 12' Lift, 18" Min Headroom
Regards,
Mark, K1RX