Reducing Rattles in Battery Rack

Overview
The rack for the battery seems to contribute a lot of rattles to the Wave bike.

Rubber Washer Approach
Examination of the screws and bolts indicated metal to metal, with space between the bolts and frame. Attempting to remove the bolts proved difficult due to poor chroming to the threads. At the hardware store we were unable to thread new nuts to the Wave-provided bolts.

What you will need from the hardware store:
 * Phillips flat stainless machine screws 5MM X 20MM   (four)
 * Hex nut locking 5 MM  (eight)
 * Rubber washer  ½ X 3/16   (four)

Tools:
 * Correct size Phillips screwdriver
 * Wrench 8MM to fit bolts

Instructions
First remove the battery from the rack, if installed.

Locate hole in battery plate front left, facing forwards from rear of bike. You will need to reassemble it this way.

Remove the plate by removing the four screw/bolts on the plate. Discard them as they are low quality and will be difficult to reassemble using them. Notice the spacer bolt still on the screw/bolt. It is necessary for the battery clearance.

Position the plate so the hole is top left. Add the first 4 screw/bolts and finger tighten a new nut to each. This will allow you to check the alignment to the rack. When correct, tighten.

Now add the washer below each bolt on the underside.

Place plate back on bike rack and finger tighten all 4 with remaining new nuts.

Final tightening is done with wrench corner to corner in an X pattern.

Replace battery.

Packing Foam Approach
One piece of the foam that protects the battery in its shipping box has been used as a shim (placed between the battery and rack). It has been reported this eliminates the rattling as well.