Quoted from Rarehero:
Can you guys install a piece of foam or felt with adhesive backing to the metal plate?
Or am I talking nonsense?
Nope. You need the transfer of energy to the captive ball behind it so it hits the target.
Not entirely true. I have had the loop velcro on since day one and it works perfectly...and it protects the block.
Maybe why I'm not experiencing the issues others describe is because of this little add on.