Replace main seals in Pardini K58

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WIth a soft cloth on a wooden stick, carefully clean out the compression cylinder bore.

Pellet pusher seal is hardest to do.
I did not do this either but here is a description of how you can do it received from a member of Target Talk.

If no pin press is available, expose pellet pusher in loading area. Hit pin holding the front of the pusher and seal together. Watch out for spring tension! The front of the pellet pusher will eject forcibly. If you use a pin or rod to knock out the pin, it will hold things together as the pin falls out. When you remove this, keep a hand over the end of the pellet pusher. Replace the pusher seal, silicone grease. Position the pellet pusher and seal at the end of the main pellet plunger assembly. While pushing rearward on the front of the pellet pusher (it is hollow at the front end) with small pliers, compress the spring and temporarily hold this together with an allen wrench. Advance the pin as you back out the allen wrench and seat it the rest of the way.

Replace the compression seal and the frame seal. Apply small amount of good quality silicone grease (Pardini, Abbey or Maplins for example).
Apply a small amount of grease in the opening of the compression chamber to ease the piston and its seal back into the bore, and press in with a thumb whilst gently rotating the cocking link with the other hand.

Screw the fore end onto the receiver by hand and remount the assembly in the woodworkers vice.
Refit the wooden "wrench" and tighten until the wrench is parallel with the front of the workbench.
remove the wrench and remove from the vice. Check that the two parts are in line at the joint. both visually and by using a fingernail on the joint.

Clean any gummy deposits from the outside of the barrel using thinners and apply silicone grease sparingly to the outside.
Refit the cocking rod and the small spacer rod before fitting barrel!.

Refit the barrel carefully guiding the pellet pusher into place and lining up the narrow groove with the pellet pusher linkage.
Once seated adjust the rotation so that the breech cover pin hole in the receiver and in the barrel is inline visually. Fit the drift and wiggle.

Carefully replace the breech cover spring and the breech cover, then tap in the pin from the right side using the smallest hammer available, e.g. modelmakers hammer. You may have to adjust the barrel position slightly if the pin bottoms out on the barrel.
Refit the barrel support.
Refit and tighten the rear barrel grub screw.
Refit the cocking lever linkage pin with the roll pin in the slot which you previously marked in pencil.
Check that the cocking lever clicks into place with a firm but not too hard click as before.
Refit the grip (the dowel nut should be fitted so the thread is showing before trying to fit the grip bolt)
Refit the palm rest.