The Hoyt website has plenty of manuals.
If your string is not quite running down the center of your bow and limbs, the Grand Prix offers a single set of adjustment screws.
I decided to adjust the bow while it was strung. There is not much play in these screws. A few adjustments on both sides made my string seem closer to center.
Besides angering online archers, what is the difference between ILF, Grand Prix, and Formula limbs?
There are ILF limbs from SF Archery and Formula limbs from Hoyt.
Recurve bows are made in a take apart design. The International Limb Fitting or ILF was first designed by Hoyt in the 1980s. Before this time, manufacturers had different limb fittings that were not interchangeable. Today, Hoyt call this the ‘Grand Prix’ fitting.
ILF and Grand Prix are the same thing.
Hoyt evolved the Grand Prix design and created the Formula fitting. It is also a dovetail system. The slide-in attachment on a Formula limb is about two inches further away from the slot. As such the attachment portion of a Formula limb is about five inches while ILF is three and one half. Obviously, the physics have changed and Hoyt has probably found some benefits from this design besides a fitting that is exclusively theirs.
Formula and Grand Prix/ILF are not compatible.
Here is a Hoyt Grand Prix Horizon riser and Hoyt Formula limbs. You can see the compatible notch, but the ILF riser ends and the Formula limb is too long to attach.
What is the difference between a riser of one family and a riser of another family? I don’t know if it is tremendously different as a purchaser of equipment. Here’s the Prodigy XT and the Horizon Grand Prix. If we don’t look at their profile with different lace structure patterns, I see a lot of similarities in the arrow platform, the stem, and the thickness of the bow. I understand that the Prodigy has a variation of ILF that I haven’t quite understood. I miss the old apple logo from Hoyt (which may be part of Easton’s old offerings, more here).