If it's the same as it is on my Graflex, the set screw for the ears takes a 7/64 Allen key. I'd suggest getting a combination tool with a bunch of folding sizes, but that's just me. Lowe's, Home Depot, pretty much any hardware store will have them. It'll help if you need to tighten down the activation box, blade retention screws, anything else around the house that uses an Allen key.
I like the larger grip area, they're pretty cheap, and harder to lose than individual Allen keys. Just my two cents.