Sorry, for the late reply, I have no spring tensioning on my rack system, the rack was placed and dowel pinned in place using a dial indicator and the traveling along the bearing rail sub-system. This provided a consistent and accurate level of tooth engagement to the pinion, the gear box is adjusted to the rack with light tension to the rack, thus having a zero backlash of tooth engagement. I keep a light coating of grease on the rack as well.