I stumbled across a neat little fishing device

It allows you to turn any "cheap" slip weight, into a expensive drop
shot weight.

The great thing about them they are reusable, as you can adjust them to
slip out of the weight before it cuts the line, thus you just slip on
another "cheap" weight.

They come with a straight leg, you bend the leg to the desired
resistance you want it to release from the weight at.

Here is a photo, showing it straight, bent, and inserted in a couple of
cheap weights
--
Rodney Long
SpecTastic Wiggle rig
Formally the Mojo Wiggle rig
http://spectastictackle.com/