Then drill out the side holes with a 3mm drill bit to fit 15mm standoffs inbetween
NOTE: Ill also add my 3D printed arms once ive uploaded to thingiverse... Ive designed to house the ESC for protection and looks as the ESC i have LED lights on them an the Clear 3D filament ive use looks great when powered on.
this is the prefect sizes as a 4 INCH frame the 3 INCH just not my sytle of flying ive also design this in a 5 INCH arm to so easy to swap out if you want just undo nuts and screw out slide arm through 3D print so no need to un do wires at all! and slide in new arm...
SO TOUGH this thing is Wicked TUFF!!! crashed a heap of times now and loves the Punishment...
The middle piece before putting together Sand the Insde edges as this where the strap goes to prevent cutting