The House Of Balsa Dust / Sand bag

SandBag.jpg

Not everything in a model aircraft will sit nicely on the bench so you can fiddle with it.
A "sand bag" made from _unused_ cat litter and a Ziploc© bag is one way to hold oddly-shaped objects still on the work bench.
Ten bucks worth of cat litter and a box of Ziploc© bags will make a bunch of sand bags.
Get heavy duty bags to resist punctures. You know what cats do when they find cat litter.