I was thinking that you “individualize” a saw for each guy. Give them each a saw according to their tasks (climber gets a 201, groundie a 261, etc) and tell them they are not allowed to share it. It’s theirs to use and take care of. If it gets wrecked, you know who to blame. Then sweeten the pot by telling them if they stick with you for 3 years (or 4,5 whatever) they can keep it as their own for good… Guy tend to take better care of the saws when they know they are responsible for them, and no one else.