I use 11/32 Bohning Classics on my ASL string made by TenRing Strings. The Classics are glue on nocks for wood arrows.
The Classics' nock valleys are actually too wide for Allen's standard serving. I could ask him for a wider serving, but instead I use the boiling water technique: I heat some water to boiling in a cup in the microwave, then hold the nock in the water for about 10-15 seconds. I then quickly nock the arrow on the string, pinch the nock tightly around the serving for another 10-15 seconds, and then release it.
The nock then fits perfectly, and retains the new shape.