Watch - this - HQ video (or this one in WMV)... and notice, like you do in other pulling positions, your arm starts the pulling movement straight. Then like so many other overhead movements you lock your arm out to receive the weight at the top. What we need to check out is the brief movement that the shoulder describes in this snatch. Watch these athletes (in the regular speed video) as they roll their shoulders back away from the KB while it swings above shoulder level. It allows you to keep your arm straight and keep the KB from crashing down on your wrist.
21-15 and 9 rep rounds of:
Left-arm Kettlebell snatch, 1.5 pood
Right-arm Kettlebell snatch, 1.5 pood
Make sure you tape your paws if you need to but pick a reasonable weight for your KB. If your hands are smoked, think push ups... And PLEASE do your snatches over the rubber mats! Por favor!