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The Kenko 36mm and 20mm extension tubes rattle when shaken; the 12mm does not. Is this normal? And if not, which is the oddity? Hadn't used them in a while so I can't remember if they were always that way. Plus after using them for the first time in quite a while on my 18-200, the lens suddenly started shaking and rattling when I tried to focus. Wound up sending it back to Nikon for repair. If the Kenko's could have caused that, I'll junk them but if the discrepancy is normal for them, then I'd hate to lose them. Thanks for any help.