noguy,

Thanks for the input. If I set the top of the swash to 1/2" from top of mainshaft with the servo pushrods I can't get full range of travel on the head - have to set it at 9/16" to get full travel. I realize this messes up the pitch range. What would happen if I used some upper pitch links in the position of the lower pitch links (so both are adjustable) to replace the fixed length links that connect the swash to the bell/hiller mixer arm. I have been over and over the geometry and it seems to me that I need to have a longer lower link to get more negative pitch. I have no clue why the geomerty has changed, but I'll keep at it.

Thanks!