Test Functionality

What happens here

Once the heat shrink tubing has cooled and fully contracted, test the modified bit holder. Confirm that the screwdriver bit is now firmly held in place and no longer easily falls out. Additionally, demonstrate that the knife blade can still be opened and closed without any obstruction or interference from the newly applied heat shrink tubing, ensuring full functionality of the tool.

Goal: Confirm the fix is effective and doesn't hinder other knife functions