2014Arms forum
Walter Klassen Pro arm modification for back mount vest and rod end bearing durability
12 years old. Gear and prices may have changed since.
What the thread found
- The Walter Klassen modification eliminates the standard pivot point by reversing the socket block orientation, which works because the reversed block sits against a stop and the aircraft pin provides the necessary pivot clearance.
- Rod end bearings on pro arms are prone to breakage when the arm is used in incorrect orientations or when mounted on vehicles, but they are inexpensive to replace.
- Removing rod end bearings through this modification redirects forces to other components that may be weaker and more expensive to replace than the rod ends themselves.
- Using this modification voids the warranty on pro arms, and any damage resulting from the modification must be repaired at the user's own expense.
- Regular replacement of rod end bearings every few years is a cost-effective maintenance approach compared to modifying the arm.
Depends on
- The modification is specifically designed for use with back mount vests and may not be suitable for other mounting configurations.
- The modification is not recommended by the manufacturer.
- One participant raised concerns about unknown failure points but did not provide specific data on what might break.