It is done during the machining process for the larger adjuster...
The OEM adjuster is 3/8-24NF thread, when boring for a 7/16-20NF thread (letter X drill, or .385) you simply offset the amount of the larger adjuster towards the fulcrum of the rocker. (I start with a 3/8 end mill, then follow-up with the X drill. it prevents 'walking' and makes a nicer hole)
When I do these, I don't 'clear' all of the old 3/8 threads when boring for the new larger 7/16 threads, so I get the full extra 1/16 (.062) worth of offset. This leaves only about 20° of old thread. not a problem considering you still have 340° of brand new thread for the larger adjuster that has much more inherent thread than the 3/8 did.
And, of coarse, I spot face the rocker for a nice flat surface for the jamb nut. Instant 1.6:1 + rocker !
