The Londinium LR24 lever gradually became a little harder to pull, feeling as if the spring was getting stronger (which obviously it didn't).
I pulled out the lever & piston and put it aside for a minute.
Next I sprayed the inside of the bore with HG stainless steel cleaner. It created a skin of foam on the bore.
I took a clean micro fiber cloth to firmly wipe all the foam off.
Then I took a new micro fiber cloth, made it wet with water and rinsed the bore clean of the HG stuff
And repeated with another new microfiber cloth and water.
Momentarily switched the machine ON to flush plenty water from the sleeve in case any cleaning agent had made it through the little holes.
Rinsed the piston and re-inserted and fastened it and the lever into the group.
Result: smooth operation!
