AS22 Series Broadcom Rotary Encoder
What is the recommended Spacer Pin dimension?
Discussed in their Application Note illustrates a tool referenced as a spacer pin to help set a proper codewheel gap. Placed between the AS22 PCB and the inner hub of the codewheel but not on the codewheel artwork itself. As per the manufacturer the diameter of the spacer pin should be 1.58mm to set the proper gap.
Application Note: AS22 Series Miniature Kit Encoder Application Note