I've found that if I take a pair of small needle nose pliars and bend the winds of the covers in, just a little and then snap them on, they stay on. For some time I used other covers and glued them because of covers falling off - but since I started automatic bending in, I have had no problem. OTOH, I agree with screws for trucks, verses the friction hold pen. Gene ABV61-1043.001.HCB
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"Skinny Dipping and Other Stories" On the web at
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or
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and look for "Into Joy From Sadness" soon.