Quoted from 3pinballs:there are 2 types of shakers from cointaker. The REd Tremor was way too powerful IMO. The other is great, however, you cannot adjust the strength via the settings as they aren't coded yet.
My wife's favorite game, she played 4 games this morning already before work.
I thought you could always adjust the strength by changing how out of balance the spinning weight is on the shaker.