I made mine out of 1/8 inch piano wire from a hobby shop. Make it 4inches longer than your cam and bend 1inch at a 90deg. up. Ls1howto.com cam can help with a pictures of the JPR. You shouldn't have a problem. I've spoke to a shop that does alot of cam swaps. And they use to just spin the cam UNTILL they had a lifter fall. It's a mess tring to retrieve. Now they use the JPR tool. And yes I agree the tool is pricey for a one or two time use. JUST MAKE ONE.. PM me if you need help. 
P.S. total cost $1.76
2003 RCSB 4.8L 5speed, BLACK
3.42, AIRAID, loudmouth exhaust
Nelson Performace Tune
2000 vett cam
160* stat
et 14.80@94mph