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“Fitting the right-hand shoulder plate an caps, and building out the left shoulder.”




Materials: The spring and the Left Shoulder Cog are metal, but the of the rest of the parts in this issue are plastic.


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Continuing Assembly of the Left and Right Shoulders

Step 1

Retrieve the Right Shoulder assembly from the previous issue. Insert the Right Shoulder Tube into the side socket, as shown:

It should slide all the way in and come to a stop at the bottom:

Step 2

Fit this side socket into the recess of the Right Shoulder Plate, as shown:

Step 3

Slide the Right Shoulder Cap with Rod down into the tube in the side socket, as shown.

This is a royal pain in the butt. It takes a lot of force to get this rod to slide all the way down. I took this picture when it started to get difficult, but I was able to push it down flush eventually. Still, my fingers and hands were numb afterwards. After I posted this issue, I heard from other builders that a drop of dish soap on this shaft makes the insertion a lot easier:

Step 4

Fit the Right Shoulder Cap into the lower end of the joint. This is a push-fit connection.

There are two small pins that hold this cap in place, so no glue is required:

Steps 5-6

Fit the Left Shoulder Cog into the Left Shoulder Plate from the previous issue. The notches in the cog should sit down over the raised tabs:

Step 7

Retrieve the Left Shoulder assembly from the previous issue. Align the screw sockets of this assembly with the recessed circular areas on the Left Shoulder Cog, as shown.

These two recesses (circled below)…

… are meant for these two raised posts:

Step 8

Secure the Left Shoulder assembly to the Left Shoulder Cog with two (2) PM 3×6 mm screws:


Man, that step with inserting the rod was brutal! At least some of the parts we have been storing are now assembled together. However, the Left Shoulder Spring will have to wait until the next issue.

Next Up

 Issue 29 – Left Shoulder Plate/Details

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