Description: -The new precision ADJUSTABLE thriple-bearing aluminum engine block is designed to replace stock plastic engine block for T-REX 700 Nitro helicopters. This new version adds ability to adjust the gear mesh between the pinion and the main gear. Therefore the main gear is less stripped due to inappropriate alignment. The new aluminum engine block is designed with rigid one-piece aluminum block to avoid wear-out problem that leads to unalignment of the pinion to the main gear, thus causing the gear strip problem. The bearing block is very well designed to have both rigidity, precision and very light weight. To further strengthen the engine clutch, this new design incorporates an additional third bearing into the engine block. This additional bearing provides great support for the motor pinion shaft to keep the pinion always aligns with the main gear. This engine block is the ticket to solve main gear strip problem on the ALIGN T-REX 700 helicopters. -Black anodizing version. Includes: -One aluminum engine block -One aluminum engine block cap -One (1) radial bearing (thrid bearing) -Hardware included -Use 2 stock bearings Requires: -Loctite all screws Weight: 41.99g Usage: -T-REX 700 Nitro helicopters Instruction: -Include in the package Features: Ability to ADJUST gear mesh Designed with thriple bearings to better support the pinion shaft for maxinum pinion alignment Very light weight and stylish design. One-piece engine block design to eliminate wear out problem of the two-piece plastic stock engine blocks.