"trimming the gizmos" -- aka Locking Devices. Yes, they are to be trimmed:
The black Nylon locking devices are used to immobilize the pin provided with furling system and to keep the forestay lower terminal in the center of the drum mechanism. If the dimension of "C" (seq 9) [the turnbuckle size] is larger than 45/64", the locking devices must be shortened.
BigZ...The locking devices -- gizmos -- are not female threaded, like the ends of the pin is (male), so not sure how to get those into the gizmos. I could create the threads as I put on one of the locking device, but since the locking device is supposed to not turn, I'm unclear on to how to create the threads on the other locking device. I almost want to find a pin of the correct diameter (7/16") without threads to replace the one that came with the kit. I have an email into the US distributor, but don't expect a response until Monday at the earliest. (We'll see how good their customer service is.)
Thanks again to all.