I have done it twice, once in 1986 (an old Spartan someone gave me, they replaced the handles); and again in 2006. Now, in 2006, I sent my wife's Deluxe Tinker in. The handles were melted and a huge chunk broken off (IF only then I knew about replacing handles, how easy it is!!). I got a package back a few weeks later. Was it the Deluxe Tinker? NO!! It was a BRAND NEW pre 1987 Champion!!! That went straight to the collector's set. I got my wife an EVO-16 at Cabellas to replace it (it had more of the tools she wanted, anyways).
SO, who knows what will happen. Yes, I did send a detailed letter of what to do, too. But for some reason, got something different.