A second batch of 4 of these tools is now available, with another five ready to be completed. They are not as nicely finished as the first batch, I didn’t want to spend the time getting the finish perfect on what is a tool, but they will still do the job.
From the original 2021 description: It’s a special tool for unscrewing the piston on the 50mm cylinder LSM groups when changing or adjusting the seals. The four prongs on the tool engage in the four recesses on the piston surface. The seals can be changed in-situ or it is recommended that the first time it is used that the top of the group is removed and the procedure carried out on the bench, this is because the piston may be tight on the stud and the whole piston assembly may unscrew. These tools are primariiy aimed at owners of the new ACS Vesuvius Evo Leva machine, they have all been tested for fit on my machine. They should fit LSM groups fitted to other machines. I have no way of knowing if they will stand up to unscrewing a really stuck seized piston that has not been unscrewed for some time. If the piston is really stuck, the prongs can be strengthened by inserting 2mm x 14mm spring/roll pins into the larger pins.
In addition, the tool is long enough to be used to push out the shower screen by inserting it through the top of the cylinder (remove circlip/snap ring first!). The end of the tool is square to the length so the shower screen is pressed out evenly so there is less chance of distorting it.
In view of the tools having a rougher finish I have not increased the price over the 2021 price, they are £35 plus £5 postage in the UK. Payment by PayPal if possible please.