The shields I own don't have drian holes...PER SE, maybe do so via hole for mounting bolt. Trap heat to speed rubber degdradation? Took 'em out, haven't looked back, no problems so far. TF, plenty of 'squitos to go around! rebr... should not have to alter mounts. Good luck with new mounts...I have several ones made in China!

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83 SD

84 CD