Pin Lock O-Ring Update
I will attempt to use the 10mm (ID) X 16mm (OD) X 3mm (Diameter) BUNA (70 Duro) o-ring.
I ordered a 50 pack from http://www.oringsandmore.com/metric-buna-orings-10-x-3mm-price-for-50-pcs/ for $3.50 (total was $6.25 including first class USPS shipping)
I will let you...