Hi James....I Sadly bought the Gen 4......Casing Cracking and fell to bits in a year, new casing required which is also failing....although they did give me a 2 year guarantee on parts.
The Reason is simple ...the "New" Parts have hairline fractures poss due to bad tooling or inferior plastic.....these develop. It's a shame, cause the machine works very well.
Host next time me thinks.
Think the newbie is after a manual brush to start.....most suppliers stock pile/groom brush's.