Here's a unique way to align your peep--center to center. Increase your accuracy by lining up your peep sight with the curve of you pin guard--you'll see the difference. Rubber tubing automatically positions peep. 1/8" dia. aperture.
|TG78 / Centra Peep||788130042120||TG78||110530163|
|TG78Y / 3/16 Black With Tubing||788130015414||TG78Y|