Do you mean like these?
http://www.champchoice.com/store/Main.aspx?p=CategoryBody&c=RAGT
Take a couple of bucks to where you can buy fishing weights. The bell type with the wire through them.
I use a large fishing hook and slip the appropriate amount of weight on the hook. I use 1, 1/2, 1/4 ounce weights and use a go, no go system for triggers under 2 pounds. Still have my up to 4 1/4 lbs trigger weights if I need.
Just place rifle vertical and using something metal like a clothes hanger make a 6" piece with a loop at the bottom for weight hook and a 90 degree bend at the top to gently set on the trigger.
Centerfire
If you're looking for splitting hairs accuracy hook a liddle wire or dacron line to a ziplock baggie. Tare it out on your scale and hang it on the trigger. Add water until she pops and weigh the assembly. Kludgy, but hyper accurate. Maybe if you're working with a group of kids could be useful??
((Sorry....My teaching bone is unsatisfied as we haven't had a Hunter Ed class for two years))
If you're looking for splitting hairs accuracy hook a liddle wire or dacron line to a ziplock baggie. Tare it out on your scale and hang it on the trigger. Add water until she pops and weigh the assembly. Kludgy, but hyper accurate. Maybe if you're working with a group of kids could be useful??
((Sorry....My teaching bone is unsatisfied as we haven't had a Hunter Ed class for two years))