Sanded holes slightly on the spinner backplate to get the hub and bolts to go through. Mounted spinner backplate and propeller lining up marks on the backplate and propeller to keep it balanced. Inserted pitch pushrod into hole in crankshaft (not enough room to insert from the back). Used provided bolts, mount the propeller. Loctited the bolts and put red paint on them. I don’t like the quality of the bolts, I ordered new (hardened) bolts from Master Carr and will drill those bolts for safety wire and replace the Pipistrel supplied bolts next time I remove the propeller or before I start flying which ever comes first.
