Gander Mountain is where my last pack came from.

+ 1 on hardware store. Plumbing section home depot. I cant find them anywhere else now. I live a skip,hop and a jump from Cabelas and they dont even carry them

Local gander mountain (killeen) sells the tool and o-rings, cabelas too, or buy from tackle warehouse (love the red ones)

TW wacky O rings $4.49 for 50, wait until their sales and get 15-20% off. They fit 4 & 5" Senkos perfectly.

Bought mine from Amazon ... 100 for app. $2.00 Free shipping with PRIME

https://www.amazon.com/gp/product/B000FMWLR8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B000FN0V6A/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

using the larger ring for 5" baits and the smaller for my 3 and 4 inch baits.

What is the significant difference of using the ring as opposed to just putting the hook straight through the worm?

If you use a senko, which are notorious for not being very durable, but preferred by some because of their effectiveness, it allows you to get more use out of one. You put the hook under the o-ring and not through the bait, so the senko isn't punctured by the hook and it won't get torn up.

I posted this in the wacky topic at the bottom of the page. I thought it was a good way to do it and save some money:

Pretty good idea: http://www.wormsinacan.com/articles/saving-your-senkos-making-your-own-wacky-rig-tool

I used to buy 100 packs of colored orthodonic rubber bands (for braces) for $5.00.. I think they were at CVS or Walgreens. They seem to fit perfect on a senko.

Buy surgical tubing. Cut in smaller pieces and quick, easy and cheap, also heat shrink works just as good as anything, quick easy and cheap all you need is a lighter to carry in boat.

Just purchased a pack at Cabela's about an hour ago. $1.99 for 25, black or clear. Just fyi.

I use heat shrink tubing and heat it with a lighter until it is snug.