If the customer is having a hard time fitting the coil/hose into the wand suggest to them to use water. DO NOT USE COCONUT OIL to lubricate the wand or hose! Just use warm tape water and get the end of the tubing just a little wet. The warm water will soften the tubing and the water will be a lubricant so the tubing slips in more easily. When the water dries it will stick good to the glass