the only opening on that receiver is the plugs. the bind is a button under the sticker
I run my 1/10 associated buggy without one because it never had one anyway.
the track I go to doesn't produce dust at all. its damp clay. so I"m not really worried about dirt. I'm worried about radio interference being mounted on top of the servo.
but you said you do it and never had problems so I know it can be done.
now if it runs off at full throttle into wall you'll be hearing about it
