On the subject of jets, when you buy a brush it comes with jets already fitted but about three months ago I bought a brush fom a well known supplier and the jets were like nothing I had seen before, much smaller and appeared to be glued in.
I wasn't very happy with those jets so I had to drill them out and fitted the 1.5 jets from Cleantech. So much better, but I had to Araldite them in because I also had to enlarge the holes to 8mm.
Isn't it about time we had an industry wide standard fitting for jets?