# Source: https://learn.adafruit.com/biometric-security-box/final-assembly.md

# Biometric Lock Box

## Final Assembly

## Make the strike.
Cut a strip of brass about 2.5" (64mm) long.  

- Measure the distance from the top of the solenoid shaft to the edge of the box lid - typically&nbsp;about 0.44" (11mm).  
- Drill a .31" (8mm)&nbsp;hole in one end for the solenoid shaft. &nbsp;The edge of the hole should be 11mm from the end of the strip.  
- Drill 2 more 1/8" (3mm) holes for rivets.  
- Bend the strike above the hole&nbsp;as shown below.

![biometric_Lockbox_Strike.jpg](https://cdn-learn.adafruit.com/assets/assets/000/003/269/medium640/biometric_Lockbox_Strike.jpg?1396794582)

## Temporarily install the strike

- Position the strike on the front of the box and align the top with the edge of the box as shown.  
- Fasten it temporarily with machine screws. &nbsp;Make sure you can unfasten it from outside the box. &nbsp;We will need to open the box for adjustments&nbsp;if the latch binds.  

![biometric_2012_12_28_IMG_1104-1024.jpg](https://cdn-learn.adafruit.com/assets/assets/000/003/258/medium640/biometric_2012_12_28_IMG_1104-1024.jpg?1396794590)

## Test latch operation
If the latch binds or fails to engage the strike, shim the solenoid and/or adjust the position of the strike as needed.![biometric_2012_12_28_IMG_1097-1024.jpg](https://cdn-learn.adafruit.com/assets/assets/000/003/262/medium640/biometric_2012_12_28_IMG_1097-1024.jpg?1396794613)

## Rivet the strike
Once you have verified that everything is positioned for proper latch operation, make it permanent and tamper-proof&nbsp;by replacing the screws with pop-rivets.![biometric_2012_12_29_IMG_1127-1024.jpg](https://cdn-learn.adafruit.com/assets/assets/000/003/263/medium640/biometric_2012_12_29_IMG_1127-1024.jpg?1396794620)

- [Previous Page](https://learn.adafruit.com/biometric-security-box/program-and-test.md)
- [Next Page](https://learn.adafruit.com/biometric-security-box/use-it.md)

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