Question from a coin newbie here -

when sleeving and keeping the arm bent, then straightening the arm to reproduce the coin later, I "catch" the coin 90% of the time, but 10% of the time the coin doesn't line up with the front of my hand, but rather falls to the side...and onto the floor!

Any tips for ensuring that I catch it every time?

When the coin is sleeved, don't move your arm quickly from side to side, or in a circle. You want to try to keep the coin lined up with the inside of your wrist and forearm inside your sleeve. Another problem may be that your sleeve is too tight, and when you move your arm inside the sleeve, it shifts the location of the coin and keeps it there.
Hope this helps, if at all...
~Jonton

Practice... over and over and over.

Please consider the material of your sleeves as well. Some materials bunch up and restrict the opening. Some even put stiffeners to preserve the form of the opening. I sugest you look into the works of Jay Scott Berry, Carl Cloutier.

Rannie Rayundo
aka The Boss
aka The Manila Enforcer

I gotta agree with Jonton,don't move your arm to quickly from side to side, try to keep the coin alligned with the inside of your wrist.

Keep practicing,
Chrix