All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
so the only reason you noticed the vibration is because of a mechanic said so? imo even if you only noticed after he said anything would be a placebo type of effect. but if you still havent felt anything i wouldnt think much about it and depending on the mechanics suggestions i would probably even start using another shop.