I figured I would just add this on here rather than start a new thread.
I was just doing a chemical back flush on my machine, only the second one I have done, and I noticed that the lever went a bit stiffer than usual and developed a squeak. Is this normal? Would it likely just be a bit of "grit" in the works?
It seems normal now.
Evening Sue, quite normal, the back flush chemical strips all of the oil and gunk from the cams and pins resulting in metal to metal contact, no lubricant = squeaking.
You can rectify it by pulling the cam out and squeezing on a bit of food grade lubricant, instant cure, or you can just wait until the coffee oils build up again and solve the problem.
As a matter of interest squeaking i.e. metal to metal contact equals wear, I always used to lubricate after a chemical BF, regardless I still had to replace the pins recently due to noticeable wear over a period of 6 years.
Hope this helps.