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No need to secure it with anything. It's just like a big wide rubber band. Once its on it does not move at all. If you did not notice there is one on the whole handle of the KT-18 in the pic. Your right, rather than putting a shim you could do a few layers under the trigger, but it does build up the back also when you do that. (Not Good for kids small hands) . The shims also keep the back clean where it contacts the web of your hand like a pistol. The 1.75" tube fits the both the KT-18 & 2. The shims are solid under the pressure of the inner tube and never budge. Get a few different sizes and you will find a ton of uses for them. The U.S. Army is held together with old inner tubes and duct tape. I have used them for everything from attaching a big mag light to the side of a M-4. (in the early days before surefires and fancy mounts) to securing my parachute static line during an in-flight rig. (a big no-go) The KT 18 only needs it if you want to go slower than the min. electronic adjustment allows. You don’t get the power curve to your selected max throttle setting with a shim that the electronics give you.
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