I designed our new ILF riser to eliminate a lot of the problems being discussed here.
I did away with the holes and set screws for lateral limb adjustment. For the most part, lateral adjustment of limbs does not work well and in more than a decade of shooting ILF bows, I only once used the lateral adjustment to compensate for a twisted limb. Also, holes at the edges of the riser pocket are a recipe for cracking and the set screws a recipe for noise.
I also did away with the tiller bolt set screw and the need for the threaded hole to pass completely through the riser. This too is a recipe for debris, moisture, and noise. I solved the problem of the tiller bolt becoming out of adjustment by using a self-locking bolt with a silicone pellet. The tiller bolt can be easily adjusted with an allen wrench, but it won't turn on its own.
In the first photo, the black riser has the through hole with set screw that threads in from the belly of the riser. The wood riser is one of our Ranger models and has no through hole on the belly.
In the second photo, you cans see the silicone pellet that holds the tiller bolt without the need for a set screw or a through hole.
There are more pictures at
www.yourlifecyclegear.com