ive never seen a tensioner bolt rust
or snap for that matter
the are coated with gold cadnium coating to prevent rusting

fact is he was the last one to touch it, its his fault
call the BBB, (better business bureau) or call the DMV

in NY, EVERY licensed repair station has to give a mandatory minimum of 30 days warranty, if they dont or refuse to fix the problem the DMV here will revoke their repair license and then they are ****ed.

so you better start making a stink pal cause that is just not right, 90% of these "mechanics" dont know what the **** they are doing especially when it comes to hondas and imports in general

dont give up your rights to some mechanic who didnt finish high school and thinks hes tought shit with a wrench in his hand and an attitude about his work

~boomer