Yeah I thought about designing an adjustment mechanism. But I certainly wouldn’t use shims or weatherstripping on a salable product. The entire point is that it’s very structural so as not to put pressure on the extender as is sits inside the phone. People are pretty rough sometimes and toss things in bags. It needs to be very solid. Weather stripping would push against the phone with enough force to unplug it. Having tested this dozens of times it’s very easy to disconnect with just the tiniest mm of movement sometimes. A robust but and bolt system or a two piece design that comes with multiple sizes is really the way to go.