Thill underwent any transfer of ownership and right now its very unclear whether any of the float will again be made. These work just as you describe except when I rig my floats as fixed floats I run the line thru the hole and then thru the sleeve, which gets pushed up the stem to the float body. Done this way they are hyper sensitive to up-ward hits down to 4-5 feet. You see the two sleeves here on these....I use two since the friction using just one doesn't quite hold the float at a fixed depth super well so I simply slip the two sleeves on after the float and run them both up on the stem with about 1/4" space between them. I leave the sleeves on when they're being fished as a slip float so I don't lose them.
Here's a picture showing how the float and sleeves are threaded threaded on the line.

The float on the right is rigged with the line laying up next to the float body and pointing up goes to the rod tip. The end going straight down goes to the jig.
I never cared for the way the Shy Bites got hung on the line even though they did a decent job on an upward hit. The Stealth style, using the hole at the bottom of the stem makes them a super hyper reactive float to upward hits, far better than the Shy Bites. The Mini Stealth floats are top heavy floats without the weight of a jig of sinker underneath them. The BB2 size was great for 1/32 and 1/24 jigs with a plastic in the 1 1/2" to 2" range, everything balanced really nice. BB3's are great for 1/16 heads.
With the line running thru that hole then being pinched along the stem, any breath of a lift whatever flips the float immediately on its side. Other floats have to rise high enough to become top heavy before they'll lay over signaling an upward hit. Any other hit is indicated just like any other float. The mini Stealths are just the kingpins when it comes to an upward hit.
The ones I make are what I refer to as being "ambidextrious", they all, for the most part, handle the 1/32, 1/24 and 1/16 heads fairly uniformly. Some have more balsa removed and play a bit better with the lighter heads and there are a couple here and there that might favor the 1/16. It really doesn't matter. The key is in the rigging with the line going thru the hole in the sten then being held tight against the underside of the float body. This is where hit recognition is instantaneous without having to have any significant rise in the float.