Your POWERUP 4.0 Accessory kit includes 4 screws to mount the various brackets required for all FliteTest Planes (Jet, EZ Streak, EZ Bug) Tornado Balsa plane, and the Hammerhead paper plane.
If you have lost or mis-placed screws you have a few options, use existing or buy local replacements parts.
a) Use Existing: The main module on your POWERUP 4.0 has an front clip which is intended for mounting paper airplanes. There are two screws that secure this clip to the module. You can remove these screws and use them with the accessory kit components. Be sure to safely store the original clips for future use!
b) Buy Local: Most specialized Hobby and RC stores will carry a selection of screws or you can look for an on-line store to source a set of replacement screws. Please use exact specs for optimum performance: PB2.0x4 mm
*Warning, using longer screws may protrude into the internal battery and damage your module permanently.