I also love the slotted football shaped indicators with surgical tubing stop. Size "small" will float a 1/100 oz micro jig fly and is small enough to be very stealthy in the white color. "Medium" is easier to see and will float high in fast water while still being small enough to be unobtrusive. However, rigging up by following the instructions printed with the package will be an exercise in frustration. Trying to pull both the leader and the tubing tight with both hands and then spin the float around them - while standing in the stream - can easily result in a lost float. Instead, I cradle the float between my first and second finger and press my thumb down on it to hold it there (all hand 1). I remove the tubing with my other hand (hand 2), and lay my leader inside the slot (using hand 2). I now have the float laying between my fingers with the leader inside it and my thumb on top of the float keeping the leader in the slot. The little piece of tubing is in my other hand. I now lay the tubing across the top of the float, on top of the slot, and trap it somewhere around the middle with the thumb of hand 1. The float is now securely in hand 1, the leader is inside the slot, and the thumb is holding the tubing down on top of the slot. Now I use my free hand (hand 2) to pinch the far end of the tubing and stretch it thin enough to slip down tight into the far end of the slot. Release it and the tubing will be inserted tightly in the end of the indicator, sticking out a little bit, and trapping the leader securely in the slot. Now take the float in your free hand (hand 2) and use hand 1 to grasp the end of the tubing that is sticking up, unsecured, from the middle of the float. Stretch it with hand 1 until it slips into the slot. As you do this, keep some tension on the leader to snug it against the bottom of the slot. Pull the tubing tight, release it, and you're ready to rock!
Sorry for the confusing instructions (its hard to write them - easier to show), but its a quick, secure method and will save you from having to watch that $1 indicator float away downstream.