I've got a fiberglass bait casting rod. A rod builder I know said that if you push on a rod blank from the tip with the handle on the floor, however it naturally wants to bend is how you want to place the guides. If that being the case,a rod made for a spinning reel would be 180 degrees opposite the natural bend if set up as a bait caster. I haven't tried it that way yet but will try this year. Whether the rod is weaker that way I don't know.