One modification to the spring system is to try using some key rings between the springs and the attachment onto the base. If one spring is too loose and two too tight by effectively lengthening the springs using the keyrings the tension can be finely tuned to achieve a smooth motion. The jump from one spring to two is huge and very coarse.
Its a matter of trial and error to get it right but the system can be very finely tuned using this method.
As for the side to side motion, try using one of those teflon lock nuts instead of the spring washer. Again, it can be very finely tighened to the correct tension to allow easy movement with no slop and will not move once set.
Good luck.
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