Kite Studio's Machined Spar Nocks:

 
PART # SPAR FIT LENGTH" PRICE
CMAN40 RET40 1 1/8" $1.10
CMAN50 RET50 1 1/8" $1.10
CMAN65 RET65 1 1/8" $1.10
CMAN370 RET75 / RET370 2" $2.00
CMAN414 RET414 2" $2.00
CMAN505 RET505 2 1/4" $2.50
CMAN610 ROT610 2 1/4" $2.50

Originally designed to provide a super strong nock for big sticks, strong enough to keep the end of the stick from being crushed. They do have to be glued in. Great example would be the bottom of the vertical stick on a rokkaku. Note: the loop at the end of beads is a finger pull.

Customer requests caused the creation of the internal nocks for the small sticks for the same stronger reasoning. See matrix for sizes.

In addition, customers in their infinite wisdom, call me with various adaptations of this fitting, which I willingly created for them or you as a special order. Internal Machined End Caps for big sticks, and External Machined Nocks for small sticks.