I bought the Hughes 1.6 cyro treated with the .4?? offset for my BB with Eddy Victor max wedge heads, I broke two of the stock adjusters(two different races ) and ate the rockers up also, of course. I then bought a set of Manton heat treated adjusters, $200.00 + and haven't had any troubles so far with any more broken adjusters I run around 275lbs on seats and 650 lbs opened, I ran the same springs on Duster motor and never broke a stock Harland Sharp adjuster Go for the best you can swing now It never hurts to have more than you need on many speed parts in motors that are raced, correct BTW, I saw about the same amount of rocker ratio differences( .030 lift varinces ) at the retainers on the T&D as I did on the Harland Sharps, I like and use Harland Sharps more now