I have a bike with ergononomic handles (Fuxon brand). Those are kept in position (as in prevented to rotate) with a mechanism which fits inside the handlebar.
This mechanism works by compressing two rubber cylinders along their axis, so they expand in the diameter.
Whenever I need to remove them for any reason (last time replacing the bar ends) it's a long battle. The rubber cylinders don't move even when the pressure is released. I risked many times ending with the rubber cylinders stuck inside the handlebar. Still, it takes no effort to push them in, but don't want this to happen again.
Any suggestion to prevent them to become stuck? Could I use some grease/lubricant, without making the situation worse or making them ineffective?
The current "solution" is to relieve pressure by unscrewing the thing, and wait. It took several weeks, until one day the thing came out by pulling.