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Maybe email this vendor Semogue 0030 Brush Support , explain the problem and see if they can get you a direct contact with the manufacturer. They must know how to.

Bob

Yea, that is an idea if you can't get the vendor or manufacturer to cough up a replacement for what might be considered a defective brush. There is something about forking out money when for lack of...

Have you tried contacting the manufacturer directly, explained your problem to them and asked for a replacement?

Bob