Plastic is about 3.0-3.5mm thick. I find the existing screws are Metric and need to be longer.
There are 4 nylon spacers between plastic guard and quad ("to clear" gold coax soldered-on antenna connector).
Thread: M2.5 Thread (0.45mm pitch)
Length: 15mm is what I use (depth is limited)
Head: Usually something like Cap-Head Hex-2.0mm
- Cut clear-plastic (from junk parts box) with Dremel to make more slim-line. Weight with nylon bolt is down to 13.1 grams. Simple and sturdy design of plastic and nylon do not interfere with antenna signals.
- Added pieces of black foam servo-tape for padding between plastic guard plate and actual gold coax connector/PCB. It's easy to check tightness of antenna coax, and antenna still easy to swap out.
- Protects connector and also prevents antenna from getting loose and twisting off into props.
- Flight Test 7-1-2016 : Flies fine.