Lee,
the only alteration to the armguard was the replacement of the leather strap with one of those elastic round laces and a plastic stopper with a pushknob. Many archers in Germany modelled their own armguards after this design after seeing me using it at 3D-shoots and saw how quick it can be put on, off and how it will always automatically adjust to the amount of clothing you wear.
With the "indexer", I usually put a small piece of leather under my leather grip that my tip of the middle finger touches, That makes sure my hand placement is always perfect. This placement is individual for every shooter. I shoot this out, because every bow has a sweet spot, where the bow shoots most accurate for the particular shooter. This handplacement is marked with the indexer for me, always gripping the bow right even in stressful situation where my main concentration is on something else...