The manufacturer Powernail is offering an upgrade to your 50P, 50P FLEX or 50P FLEX POWER ROLLER tool for FREE (until 12/29/17)! All you have to do is go to the following link:
Put in the serial number(s) of your 50P series machine(s), enter the address where to send the parts and you will receive the parts necessary to upgrade/optimize your tool(s)!
The video at this link shows you step by step how to take off the old part and install the new one (very simple).
This is a FREE offer that will run until 12/29/17. If you would like to upgrade your tool AFTER that the cost will be $136 each.