Originally Posted by tex_n_cal
Haven't looked at an HK91 recently, but Snap Ring pliers will frequently have small tips as described. There both internal and external ring-type-pliers, and some come with interchangeable tips to get the exact size needed.

http://www.ebay.com/itm/4-in-1-Snap...iers&hash=item4ab5094c50&vxp=mtr
Yep. That was my thought, too, but I didn't realize that gripping those snap ring pliers opens them up instead of closing them. I bought a set and only found that out when I got it home. Ace Hardware was nice enough to give me a refund, but they didn't have anything suitable, so I went to Home Depot and found a small pair of electrician's needle nose pliers that had a sufficiently tiny tip.