Here are some pics of the old (left) and new (right) vibration dispensers and a pic showing the inside of the new one. 

The old one uses a mason jar lid, a 100mm end cap, and a ~90mm disc of PVC cut from another end cap as the vibration platform and a slice of wine cork and some screws to make the motor vibrate

The new one uses a couple circles of flexible PVC board as the vibration platform and two sections of a small terminal strip with a 2mm bolt and 3 nuts to make the motor vibrate.

The new one works a little better, is more reliable (I was always afraid the cork would fall off) and the parts are easier to make.