FRETS.COM
Shop Tip #323
© Frank Ford 2006; Photo by FF

I have a very lightweight tripod I use with a lightweight digital camera.  The entire rig is stable until I accidentally kick one of the legs and send it toppling over.  So I added weights to the base each of the three legs - they're simple lead bars held on with shrink tubing.  Now the tripod is amazingly stable, no matter how clumsy I am.