I have a K780 Blue Streak to assemble and fly for this weekend and I have an issue I haven't encountered before. The forward bulkhead of the motor is so loose in the liner, that the small, aft o-ring won't even engage the inside diameter of the liner. I'm wondering if epoxying the bulkhead in place would be an option? All the other fits seem fine (forward and aft bulkhead o-rings engage the motor case, the liner slides in the case fine). Thanks for any advice.