I was working on a friend's garden the other day & I remember thinking at the time that the vibrations from the strimmer & the mower could be quite beneficial that way.
okay....althought i strongly recommend just getting the balls to go out and buy an actually vibrator cuz they are AWESOME.....get a gillette razor that vibrates... and put it in side of one of the tubes of a cigar=pretty good....CAUTION: buying a vibrator may cause so much satisfaction that you'll buy five ( personal experience)