Is there an effective, non-destructive way to mark the seatpost position?
We share some bikes within the household, meaning that the saddle height is adjusted often. When I had an affordable Decathlon bike, it came with a seatpost that had centimetre markings on it (like this). This was very helpful in quickly setting the preferred saddle height for any family member. Unfortunately, most other manufacturer's don't include this feature, and Decathlon's own seatpost is not great (no angle adjustment for the saddle).
Is there a reliable and ideally reversible (or at least non-destructive) way to mark certain positions on a seatpost? A hard scratch would work, but it is not reversible. I have not found a marker pen that works because of: (1) black background (2) it rubs off easily when the seatpost is slid down.