Mikado is known for solid craftsmanship on their products, and you can expect to get what you pay for when you buy Mikado. They are not normally known for having many upgrades, mainly because they seem to get it right before they release a new product. Just recently they released a new counter bearing system that also provides main shaft support that couldn't hurt to include in your machine. They also include a solid one piece yoke that allows use of the 12mm shorter main shaft.
The kit will include all the necessary components to make the upgrade complete. The shims for slop reduction, head dampeners and the custom push rods are in there also. The main counter bearing system is constructed to create a solid block structure for full support of the main shaft and the bearings throughout the flight. The new upgrade is designed to fit the Logo 500 SE, or the 500 SX helicopters.