FingerTech 'Viper' Lifter Add-On

it is hard to use as a SriMech

Very impressive kit.
Simple to install, strong, appears solid (based on garage skirmishes with other lifters, not full-on battle with spinners), adds self-righting capability.

After building 3 kits, I have the following comments/recommendations:
1 - Use servo L-bracket holes 1 & 4, not 2 & 5.
2 - When attaching the Viper top armor, slide the armor left/right so that the arm screw does not contact the top armor, then torque the armor screws.
3 - Add washers to the lift arm/small nut strip joints to minimize the chance that these screws will back out or tighten when operating the arm.
4 - Add a nut to the servo arm/lift arm joint & torque it to the servo arm to minimize the chance that this screw will back out or tighten when operating the arm.
5- Set Tx channel 3 endpoints to 120% or the arm will not move far enough upward to self-right. [Already done if Tx purchased from FingerTech]
6 - Do not mount a power indicator LED on the back wall of the Viper. It will stick out just barely enough to drag on the ground & hamper self-righting when the bot's nose is pointing straight up.