Question about Factory Adjustable Rockers

I'm thinking about using the factory adjustable rockers, for now anyway. I was looking at the adjusters and there is no lock nut. Seems that they are tapered so that they get tighter as you screw them in. Are these sufficient or should I get some of the Crane locking adjusters for $50 from Mancini? I'm using a 507/510 Comp cam. Thanks.
Author: admin