My Silver Star 0.177 was desieling every couple of shots. Fitted TBT kit today and it's totally transformed it. I totally cleaned away all the original grease from the inside of the cylinder and piston. I removed 2 coils from the spring then retrimmed and ground where I'd removed the coils. Lightly greased (with the TBT grease supplied) the back of the piston and spring and re-built using the TBT kit. The pistol is now easier to cock and shoots with less recoil and no dieseling. Chronoed at 514 fps (4.95 ft/lbs) using JSB Exact 8.44 grains. Variation of 4 fps over 20 shots. Accuracy at 10 yards is now on a par with my recoiless FAS 6004.