How to Install and Optimize
Your Johnny RX-78-2 Shield Keycap

Step-by-step installation guide: compatibility check, removal, installation, RGB optimization, and long-term care.

The Johnny RX-78-2 Shield Keycap fits most mechanical keyboards, but verification prevents disappointment.

Stem Depth Specification

The Johnny keycap accommodates stem depths from 3.5mm to 6.0mm. This covers standard plate-mount switches, most PCB-mount configurations, and common aftermarket modifications.

• Wire keycap puller (strongly preferred over ring pullers)
• Soft cloth or towel (to rest keyboard on)
• Optional: Compressed air for cleaning

Avoid ring-style pullers for this installation. The wire puller distributes force evenly and won't scratch the PBT surface or your keyboard's plate.

1. Power down your keyboard (unplug USB cable)
2. Place keyboard on soft surface (prevents scratches, provides stability)
3. Photograph your current keycap layout (reference if you remove multiple caps)
4. Identify your target key (default: Backspace)

The Johnny shield ships configured for Backspace (2u width). While the MX stem fits any position, the width should match your target key.

Using a Wire Puller

1. Hook both wire loops under opposite corners of the keycap
2. Apply even upward pressure—don't pry from one side
3. Pull straight up until the stem releases
4. Set aside the original keycap (store for future use)

Critical: Don't Do This

• ❌ Twist or rock the keycap (stretches the stem mount)
• ❌ Use excessive force (can damage the switch)
• ❌ Pull from one edge only (bends the stem)

1. Inspect the switch stem for damage or debris
2. Blow out dust with compressed air (optional)
3. Wipe the switch housing with a dry cloth if needed
4. Check the surrounding keycaps for alignment

This is your best opportunity to clean—take advantage of it.

Alignment

1. Orient the shield design correctly (the "top" of the shield faces away from you when typing)
2. Position the keycap directly above the switch stem
3. Align the cross-shaped stem mount with the switch stem

Installation

1. Place keycap gently onto the stem
2. Apply even downward pressure with both thumbs
3. Press until you feel/hear a click (the stem locking into place)
4. Test by pressing the key—it should move smoothly with the switch

The Johnny shield is RGB-compatible (light shines through) but not self-illuminating. Here's how to maximize the effect.

Color Recommendations

Based on the RX-78-2 color scheme:

• White/Cool White: Matches the shield's base color, subtle enhancement
• Red: Accentuates the EFSF and heat-dissipation details
• Blue: Complements the joint/coolant color elements
• Yellow/Gold: Highlights the Core Fighter pattern engraving

Monthly Maintenance

1. Remove keycap using wire puller
2. Rinse with lukewarm water (no soap needed)
3. Pat dry with microfiber cloth
4. Allow to air dry completely before reinstalling

What to Avoid

• ❌ Abrasive cleaners (damage nano-coating)
• ❌ Alcohol or solvents (can affect resin components)
• ❌ Ultrasonic cleaners (unnecessary for PBT)
• ❌ Dishwasher (heat and detergent too aggressive)
• ❌ Direct sunlight storage (UV exposure over time)

Ready to Install Your RX-78-2 Shield?

Includes installation guide. 45-day handmade production. Compatible with Cherry MX and clones.

Disclaimer: This is a fan-designed artisan keycap inspired by the RX-78-2 Gundam. It is not an officially licensed product and is not affiliated with Bandai, Sunrise, or any rights holders.