Dear Jackie,
Good afternoon.
Also I hope you’re going to have great and happy 2016 year.
Ok, I checked the videos and service report from you.
It seems like a faulty of the 4.5mm cartridge.
Because the other 1.5mm cartridge’s workable with same configuration includes ULTRAFORMER and Hand-Pieces.
As I checked the S/N of the defective 4.5mm cartridge,
It has been passed out of warranty already.
Because CLASSYS provided only 1 year warranty period for consumable parts something like Cartridge.
Really I’m sorry to give un-satisfied answer for your inconvenience situation.
Please kindly understand our repair policy.