Step 19: Place ink cartridge in mini-pen, and you're done!
Once you are happy with your whistle, you can turn it back into a mini-pen for storage. Slide the now-shortened ink cartridge back into the pen. If d...
Step 16: Place the mouthpiece on the end
You can use your original pen lid to force open the mouthpiece enough to get it over the end of your whistle. The positioning of the mouthpiece will be a variable you will have to adjust. Look at the next step for troubleshooting ideas.