This gripper was designed for two servos to be joined by a Y connector and to be run on the same channel. Because this makes the two servos move in the same direction (both left or right, rather than toward or away from each other), the pivot brackets that make up the gripper arms need to be offset and facing the opposite direction. Grippers with servos running on different channels can be designed differently.
Figure 1 1. Attach a servo horn – on the inside – to one side of a pivot bracket with four screws and kep nuts (Figure 1). Repeat this with a second servo horn and pivot bracket.
2. Place a pivot bearing flange-side down on a flat surface. Place the side of the pivot bracket opposite the horn over the bearing and align the
bracket hole to it. Press down firmly to pop the bearing into the bracket hole. Set aside the pivot bearings’ screws, nuts, and washers until Step 5.
Figure 2 3. Connect two channel pieces (the model shown uses 96 mm channels, but different sizes can be used depending on how high you need the
gripper to be) side by side with at least four SHCSs and kep nuts – two on each end (Figure 2).
4. To each side of the connected channel pieces, attach one single-servo motor bracket. The two should be directly across from each other, but
one should be facing up and the other facing down.
Figure 4 
Figure 3 5. Thread the bearing screw through the bearing from the outside of the pivot bracket. Insert the screw into the back of one motor bracket (Figure 3). Secure the pieces together with the washer and nut and tighten the screw – but do not overtighten. Repeat this with the other motor bracket,
keeping in mind that the servos will face in opposite directions (Figure 4).
6. Connect the two servos with the Y connector. Attach the Y connector to the remote control system and power it up. This will synchronize the
centering of the two servos. Leave the remote control powered up.
Figure 5 7. Place the servos into the brackets with the servo motor shafts facing toward the servo horn on the bracket. Secure each servo to the motor bracket with 3/8" BHCSs. With the servos still connected to the powered R/C system, attach the pivot brackets to each servo where you
want them – you will have to stretch the end with the horn over the servo (Figure 5). Power down the R/C and detach the Y connector from it. Secure
the servo to the horn with the servo screw.
Figure 6 8. To the end of each pivot bracket, attach a 32 mm channel with the open side facing away from the bracket (Figure 6).
Figure 7 9. On the top of each side of one 32 mm channel piece, attach a flat bracket at a 45° angle toward the open side of the connected channel pieces
(gripper arm) (Figure 7). Repeat this on the other 32 mm channel piece, but place the flat brackets on the underside of the 32 mm channel
ends – this will compensate for the difference in height. Be sure to angle the flat brackets toward the other side of the gripper.