Instead of buying an upgraded switch, it would seem possible and economical to upgrade the switch if the parts were available. Unfortunately, the parts illustration manual does not show the key parts breakdown of this switch. I took it apart and found the construction to be relatively simple. The four slider connections are of heavy construction but because of the fact that they are not sealed to the atmosphere, they tend to corrode and get scratched during operation. I lapped them with emery stone and plastic and wetpaper to 1500 grit and they shinned up well. I only need now is a .094 thick bar of C110 grade copper cut and drilled for the replacement bus bars. The original bus bars are about .060 thick pieces of aluminum so the copper replacement should be about 4 times the conductivity of the original. I believe the disassembly and assembly of the switch is easy enough that it should be a part of the maintenance schedule in order to keep the cart's power up. The only hassle is disconnecting and connecting it in the cart.