When an honest and polite attempt has failed to cease the intrusiveness, then size up his back side and see if his arse will accomodate the propper placement of said instrument....and shove it where the sun can't shine. We all can screw up on occassion, but there cames a time when just "SHUT UP" ain't enough.
One on one and not to single him out with others present, ask him to lighten up on the hand-drum or not play at all on your selections, that it is disturbing and that you lose your concentration and can't keep in touch with your music.
Mudjack