For the 510 Butter Stick I would go with a Loop Classic 5/8 or even a 7/9 depends what line combo you need to put on it. It throws a 400 gr so i would lean toward the 7/9. I would take the stick down to a shop and check out the balance with the reel first. That rod from what I remember is fairly light and you don't want too heavy a reel. Great reels the classics I have a couple that i love.