The cost of the part missing, yes, but for all the work done? Really? If you buy a chainsaw off saw one and saw the bar/chain came with it and poked through and fell out of the box... you think paypal should refund you 100% when you still get the saw less bar/chain? Put the show on the other foot and see if you agree. I don't care how rare the part is, it's total bs. I restore 60/70s cars and have been for 20 plus years, it happens, parts get lost, but unless it's 100% no replaceable then, no way this is right.