Are you sending the .18 to horizon? I'd take it to a hobby shop and send it to OS, they will replace it completely if it is broken for the amazing price of $6 for the shipping of the new engine. And you don't need a receipt, because they don't put serials on their engines (at least not on the 30VG). I bought my OS30vg for $100 and it had scoring on the piston, and in 2 weeks I had a brand new 30 for the whopping price of $6. OS Rocks.

Good Deal