With your bits cleaned and lubed, replace the piston, mainspring and guide into the cylinder. Compress the spring and screw on the endcap and then replace the screw on the cap.
To compress the spring and get the cap on, I place the breech jaws of the cylinder onto a piece card on a piece of wood and then press down from above with the cap. You should be able to get enough of a bite if you turn both hands and then keep the weight on while you get another bite with one hand.
Replace the barrel, pivot screw and lock screw (You,ve already re fitted the plunger,spring and grub screw---Remember?). Locate the cocking arm into the trigger housing and line it up with the big hole and replace the pin. Locate the cocking arm in the breech block and replace the pivot and lock screws.
Replace the sear and it,s pin and then the trigger and it's pin. You should be able to cock and release the gun now to check you have it in the right place.
Put the trigger spring into the hole in the grips and lower the action into the grips, checking the spring is going into the hole in the sear.
Replace the 4 grip screws and then hook the trigger guard onto its pin and refit the screw into the grip.
only had a quick go with this gun and have been told by the previous owner he cut down the mainspring a little. He also built up the foresight with weld as these guns often shoot high (along with the Slavia ZVP and Chinese Copies). It seems a nice accurate pistol but kicks up a little, which putting down the the lug on the piston, adding weight.
I like this and the Slavia. Nice simple designs.