You have to disassemble the heli to gain access to the tail rotor gear........sometimes after a crash the gear will mess up making heli spin.......change gears and replace gyro with <span class="Apple-style-span" style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">GY192......there is no specifin measurement for tail rod servo adjust....try to keep the 90 degree angle withthe servo horn......with the tail blades in neutral position....that will get you close for alignment.....then you can fine tune it with Tx........let me know how it goes or any questions...........I have a G2 Raptor and have had it apart several times....... I also have a Dynam 450....it came with the</span><span class="Apple-style-span" style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">GY192....gyro.......I had gyro issues with raptor and decided to try the Dynam's</span><span class="Apple-style-span" style="font-family: Verdana, Arial; font-size: 13px; background-color: rgb(251, 252, 255); ">GY192....it worked perfectly......XHELI has them for about 13.00 bucks.....great deal........just plug it in and your ready......
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