I'm aware that you can use 正好 or 碰巧 to express low probability in statements, equivalent to English "happen to" .
我正好是有你要的那种啤酒。
我发现他碰巧就是我的一个远亲。
How can you use this same idea in a question?
"Do you happen to have an eyeglass screwdriver?"
Edit: I want to express that I'm aware the probability of them having the [unusual item] is low, but that I'm asking anyway.