Hi there hey there ho there, ok so I have a vintage Patriot set up for HEPA with a 350e Sebo powerhead and it all works GREAT. However, I recently am getting some indication from the banks of idiot lights that the BRUSH STRIP needs replacement and lo and behold I looked at it and the bristles look like 3/8" long WAY too short not good, and so the idiot lights are not such idiot lights after all! I did order a new brush strip online but HOW LONG are the bristles new and how short can they get before replacement is necessary? Hmmmmm.