Yalex - thank you very much. Anxious to see your project and posts.
Here's the first "servo sled" installed and operating.
Only the course braces are attached. This is the sternmost servo that controls the fore yard rotation.
I replaced the coarse yard bungee brace pendants with solid line, so all slack comp is from the sled. Total travel is only 3/4" from square to fully braced, but since the springs are now on the tubing and take up travel length, about only a bit over an inch of total travel L is available anyway.
Without the bungee pendants, the yard position is very stiff over all the rotation. Very little slop...the spring may be a bit too strong, but that's probably OK.
The new drum diameters are a bit larger than the old ones. With the old drums, almost +/- 2 rotations were needed (almost 4 total servo rotations) for full port to stbd yard rotation. Now only +/- 1.5 rotations are needed (3 total for the servo, which is spec'd at 3.5 rotations)
Operation looks better than the old system - definitely less slop. And more rotation! Old max was about 50 deg if I remember right. Measured a solid 55+ degrees with the new system.
Any observations/.advice appreciated.