I guess you could say the surging is an electrical problem? The swap top has a flex-shaft attachment for carving. I have played around with it a little. I want to cut a gem, like an emerald shape and, on the bottom use the flex-shaft to cut and polish little dimples. These will look like bubbles from the top looking down.
Good job on the Topaz! looks clean for being freehand.
Good job on the Topaz! looks clean for being freehand.