Here are SEBs instructions for the 1st generation:
There are two basic methods to adjust the tension of the SEB rest:
A). By tightening or loosening the 4 (four) tension screws a very bit, without loosening the counter nuts at all.
B). By loosening the counter nuts, turn the tension screws counter clockwise for about 2 full rotations, & set the tension from the very beginning.
Both methods work. Both methods need some of “trial & error”, i.e. to find the best setting / to suit your own liking.
Method A:
Use the metric allen wrench & ring spanner included in the package.
Adjust/turn the tension screw one by one. (You might first need to remove the joystick from the center shaft).
Use the ring spanner to hold the counter nut in place while you turn the tension screw with the allen wrench. Turning the tension screw clockwise (just a very bit, -- think about 1/16 rotation or so) will increase the tension. Turning the screws counter clockwise will decrease the tension.
Adjust / set the tension screws until you find the best setting, then re-tighten the counter nuts to moderate tightness only.
Method B:
We will try to set the tension from the very beginning step.
1. You will need to loosen the 4 (four) tension screws & the counter/jam nuts for about 2-3 full turn, counter clockwise.
2. Then turn the screws clockwise, just with bare hand, so that each end tip of the screws push / make contact with the sliding mechanism inside of the coaxial unit.
To avoid any slob/lash on the rest operation, be sure that the tips of the tension screws make contact with the “slots” on the teflon pressure plate.
3. Then try to operate the joystick to all directions (up-down-left-right etc), and put some vertical force on the rest top with your other hand (as you see fit to the weight of your rifles), to see how much resistance is there.
4. By feel, adjust the tension by turning each tension screw, clockwise or counter clockwise, until you find the best setting and the most uniform tension.
Normally, each screw needs to push the sliding mechanism in a similar pressure. However, you might probably need to adjust the tension screws in different pressure to find the best setting & uniform feel of the joystick motion.
You may need to make some of trial & error by tightening the upper screws, or the lower screws, or maybe even just one screw, to be more familiar with the tension & the changes. Basically, try to find a uniform tension, determine how much weight you want the rest top to resist, and how smooth the joystick motion. It is about combinations of these things.
The tension of the SEB rest is factory set to accept (at least) 13 lbs vertical weight on the rest top. However, due to temperature difference between Indonesia & your part of the world, the tension might vary/different in your area. Please remember that teflon sheet can shrink also.
5. Re-tighten the counter nuts again.
You will need to hold the tension screws in place (using the allen wrench), and tighten the counter nuts with the ring spanner.
6. Final adjustment -- Re-check the tension, the joystick motion, & how the rest top resists a vertical force.
Please remember that factory screws & nuts have some slop/lash in them, so you will need to check & probably to adjust the tension screw a bit again.
Once you get the four screws adjusted equally and the feel is almost where you want it, pick a screw (any one screw, your choice of the four screws), one you can remember. Make the final adjustment gently with that one screw only.
While it is true that the four should be as close as possible to the same tension, a final tweak with one screw only will not undo all your efforts at making them the same.
If you'd like the entire set of instructions, pm me with your email and I'll get them out to you.
paul