Originally Posted by Bob Barry

yeah the arm mod is pretty much standard now across all of the vehicles. Allows the cars to have a more forgiving and plush landing. I suggest after each weekend you pop the arms off and just run a reamer through to clean out any dirt.

One of the side benefits is that if you do get a slight hingepin bend, your arm won't bind up. Obviously you'll want to replace that hingepin, but you'll finish your race without the arm locked into one spot.