Replying to Play in the heelpiece of marker griffons

just mounted the heelpiece back onto the rail on my on3p's and there seems to be some play in the heelpiece. The rail actually drilled into the ski is secure but the heelpiece itself wobbles just a bit. dosent seem dangerous but dont really have anything to compare it to as my other bindings are fks and dont use a rail piece. Is this normal. dont worry about mounting it by itself as i am a certified ski technician and worked in my ski rental shop so i know about forward pressure and all that jazz