Strange, what holds the rubber in a standard wagtail then.Underside of Wag channel is not designed to hold rubber and in fact if it is then the angle of the channel is probably wrong. If you not going to drill the channel then toss the screw. It will just continue to strip out on the plastic... I used a thin strip of Velcro as packing.. Just experiment until it's tight and the angle is working for you. I'll see if I can find my 'how to'.
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