When I instaled mine I didn't even bother with the thin one. What I did do was install the new cable anchor against the limb and then used the stock anchor on the outside. This way I could use either anchor depending how wide I wanted to spread the cables.
The reason I don't think the thin one is needed is that because the ccable yoke pulls the anchors at an angle they are always being pulled in against the limbs anyway. For 1/64" or so I just let the axle float.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver