Put there name on a particular saw. Tell em this is your saw to look after. Let them know you will BUY the saw off them in a year or for how long you think the saw should go unbroken and 100% usable. Any repairs come off the saws value. Its a cash bonus for them not busting the saw.
Or hand them the saw with there name on it and say its there saw after 2 years. Now if they do no breakage in 2 years they get the saw for free (or put it on ebay and give them the cash). If the have broken it they have to buy it for the cost of replacement parts or buy it without the replacement parts on the say (keep em for spares)
Get a punishment saw, maybe a wildthing (good idea dingeryote). Paint it pink. Make it the saw a guy uses for a week if he breaks a saw. after a week he will want to avoid the wildthing nomatter what.
Or hand them the saw with there name on it and say its there saw after 2 years. Now if they do no breakage in 2 years they get the saw for free (or put it on ebay and give them the cash). If the have broken it they have to buy it for the cost of replacement parts or buy it without the replacement parts on the say (keep em for spares)
Get a punishment saw, maybe a wildthing (good idea dingeryote). Paint it pink. Make it the saw a guy uses for a week if he breaks a saw. after a week he will want to avoid the wildthing nomatter what.