Update...............
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I'm changing all the servos in my AS350B to Futaba S3107s. Check out the specs on these. and direct bolt in for HS55, EXCEPT depth and output shaft height. This should allow almost perfect alignment of the cyclic servo arms, with better centering than the hiteks. Going to run a S3110 on the tail I think.

Found these today at the LHS and when I compared the S3110s they did not fit and the S3107s did and the specs are great. I was purchasing the S3110s for my new SJM400, but I sold it to get the MAXIR SE and the S3107s are perfect for it too. I'm going to get a set for the ECureuil as well. Should be the perfect servo, stronger and faster and a better fit for this heli.

Ken