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“In this issue, the assembly of the central part of the Mark III armor begins, with the chest piece that will support the breastplate. Assembly of the work base also continues.”




Materials: The Chest Structure and Support Masts are metal. The other parts are plastic.


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Chest (1)

Stage 1 – Assembly of the Arc Reactor Mechanism
Step 1

Fit the ARC Reactor Holder to this matching location on the back of the Chest Structure, aligning the tabs as shown:

Secure the Reactor Holder into place with two (2) EM screws.

This is your friendly reminder to try using 3-in-One Oil on all screws going into metal:

Step 2

Slide the narrow end of the Reactor Mast through this raised circular detail side of the Base Plate for Reactor Mast, as shown:

Fit this Base Plate to the back of the ARC Reactor Holder, as shown:

Secure the Base Plate to the Reactor Holder with two (2) IP screws:

Base (2)

Stage 2 – Assembly of the Support Mast
Step 1

Slide the narrow end of the Support Mast 1 into the hole at the end of Support Mast 2:

Step 2

Rotate the Support Mast 1 inside Support Mast 2 until the two holes of the overlapping section line up. Then, insert the two Pins completely into these holes. If needed, use a small hammer to tap the Pins into place.

I did indeed need to use my small hobby hammer to seat these Pins fully:

Step 3

Wrap one of the Adjustment Stickers around the opposite end (away from the Pin holes) of the Support Mast 2, as shown.

Only one Sticker is needed here – the other is a spare. This Sticker is meant to help firm up the connection of this Mast to the Base. If you slide the Support Mast into the hole of the Base Cover (from the previous issue), you may notice it is a loose fit:

We simply need to wrap an Adhesive Sticker around the lower part of the Support Mast (below the flange):

Then, test the fitment of the Support Mast into the Base Cover again. It should be a much tighter fit now:


This Reactor Mast will act as a ‘button extension’ to allow us to turn our Reactor light on and off from the back of the chest armor once the model is complete. As I am doing Central Lighting on my build, this part will not do anything but I installed it anyway.

Next Up

Issue 73 – Chest 2, Base Support Brackets

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