Just as they will occasionally strike indicators or tiny floats on slip-sinker rigs, fish might strike the Toobie rig. In that case, the Toobie setup could slide down to the fly or bait, so check it before the next cast. Toobies can slip, just as split shot can when pinched to very fine tippet, say 6X at 3- to 4-pound test. There are ways to reduce this likelihood, however. No. 6 shot is usually used with the medium-sized tube, but if you're using only one shot of this size, you're better off using the smaller tubing included in the kit. The shot will be a bit harder to insert, but it will be less inclined to wander on the line. Moistening the shot first (remember, it's nontoxic) will help. Ditto for a single No. 2 shot, which should be put into the medium-sized tube.