On the part where it says to drill the spots for B,andC hole it said some models my be larger I took that as if they at go to the next size up bit and for the B hole it was already bigger than the number5 bit so I drilled it out to the number6 bit and the C hole said use the number4 bit well it was already bigger than the number5 bit also so I went with the number6 bit and the D hole said do with the number6 bit so I drilled all 3 holes with the number6 bit and I think that was a very bad idea now and I didn't use the spacers for the 2nd to 3rd torque correction servo nor did I use them in the 3rd to 4th torque correction servo I didn't think it was necessary but I guess it is