Only when the tip fits nicely with no endplay is the tappet properly adjusted, if the tip doesn’t fit, OR if there is up and down endplay, the tappet is out of adjustmentAfter adjusting the tappet, simply insert the tip of this tool under the hydraulic unit retaining clip, above the pushrod seatWill not work on Solids, JIMS® Hydrosolids or other limited travel tappetsHand tool simplifies the way to verify proper tappet adjustmentMade in the U.S.A.