Adjust the blade edge on the lever, align it with the bottom of the valve seat, and tighten it. When using, first select the size of the cushion cover to match or match the size of the valve seat, insert the valve seat on the cylinder head, insert the size about 1mm or 2mm, and then select the positioning guide (8, 9 12) Align the gasket cover on the valve seat ring, insert the positioning guide into the valve guide, screw down the lower bracket, and turn the upper bracket, you can press the valve seat ring into the cylinder head smoothly.
eBay