just put my a/c belt on the other day. after i tok off the main serpintene belt i only used a screw driver for the a/c. put all the way over the a/c compressor pully and as much as i could over the other pully. turned the engine over shut it down, and voila! ac belt is in place.

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'73 VW camper
'80 300td wagon

luckys420:
Sometimes that works but it often times it stresses the belt (it can tear some cords internally) and the belt fails prematurely. Keep an eye on that one.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold