Hi- I have a brand new Heathkit unopened kit. The Heath "Non-abrasive Jewelry cleaning kit, model number GD-1151-H. Ultra sonic cleaner. >From the Heath Winter 1990 catalog number 219, page 27. I am in search of: a 500 Hz (285), two 250 Hz(282), a 9MHz-500 Hz (217) and maybe a 1.8KHz (288) How can we swap? 73 de dave in NH