Kit is designed to work with Manton #2700-0030 or #2700-0030A pushrod length kit and very simple to use.
Pick from the four diameters of sleeves, slide on pushrod tool, put a supplied O-ring on each end to hold sleeve in place and rotate motor around to check for clearance.
Kit includes a handy storage tube, four O-rings and four alum. tubes that measure .437", .500", .562" and .625" outside diameter.
Treat yourself and never be a victim of pushrod clearance issues again.