I installed the hdsi transducer for a helix 9 si unit and noticed the pin that goes through the transducer connecting it to the bracket doesn't tighten 100%. The screw is as tight as it can be but it leaves some play....Should I add another washer or two to get a 100% tight unmovable unit or does it have a little give on purpose? Can't seem to find anywhere that it says it should have a little play so figure I'd ask and hope someone has experience with the hdsi transducer. The way it sits the unit can move about a 1/2 inch up and down. Thanks! 

Add a washer. It should only move if it hits something so it doesn't break off. Otherwise, it should be snug.

Tried adding more washers, doesn't make a difference. After reading a few more articles it seems this is a norm and is part of some sort of safety set up to just pop it up rather then break the unit if anything is struck. Doesn't seem right to me to leave something with play but hey I'm sure they've done it for a reason.