I found a set at Amazon.com that claims to include an E-11 by SUNEX. I don't think you need one for the pulley but it might be nice to have for who knows? It costs $22.00 plus shipping or $29.00 without shipping charges. Yeh, I bought a set at Harbor Freight, hardly Snap on's but they were almost giving them away and seem to work just fine. Don't ya just love/hate China?