What to use for neck support during level and crown?

I've heard of folks using a bag of buckshot to support the neck during a level and crown. Can't find that but is there an alternative to these? I'm not cheap on tools, but seems like there's gotta be a simple solution for this one. phonebooks? :confused:

http://www.stewmac.com/shop/Tools/Special_tools_for:_Inspection/Rock-n-Roller_Neck_Rests.html

Get some builder's plaster or auto filler. Mix it up and add chopped up fabric - maybe some old thick cotton. Wrap your guitar neck throughly and tightly in cling-film. Get a firm shallow cardboard box the size of a neck and pour the gunk into the box. Push your neck into it and wiggle it around until the gunk comes up to almost the fretboard. Wait for it to set and remove your neck.

Line it with some thin fabric (this also helps hold the neck tight). Custom built, perfect fitting neck support - although you might need to make slight adjustments for other necks if they come from a different Fender era or have massively different profiles/thickness.

How about a sand bag? I use a neck jig, but I had the luxury of being able to afford one a while back so I got one while the getting was good.

I either use a wooden V-block (kind of a huge version of what machinist's use to hold round stock on a drill press) padded with a towel, or a bag of popcorn kernels stuffed into a zippered vinyl pouch (a freebee years ago with contact lens kit). The popcorn bag works well as a shooter's rest but I sold my rifle to buy more guitars...

I use this one

Stewmac Neck Support Caul (http://www.stewmac.com/shop/Fretting_supplies/Pressing/Neck_Support_Caul.html)

http://www.stewmac.com/catalog/images_1lg/4479_1lg.jpg