The wrist pin should have brass pads either end and, although it's hard to tell from the photos, I think the pads are there. To free up the wristpin in the rod, put the piston back in the liner to limit the sidewards movement then, with a bit of heat or by filling the interior of the piston with acetone, use some pressure on the rod to start sliding it along the wristpin. Once it starts to move it'll free up quite quickly and once out you can give it a clean with fuel. Before you remove the rod, mark the side showing in the photos as the side facing to the back of the engine so it goes back into the piston the same way it came out.