Being in two planks makes it possible to remove and refit the wood with the springs in place .... it's a bit of a jiggle but they go in (don't ask how I know
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A single piece would mean removing at least the rear bolts of the springs and lifting the axle a bit to refit. One nut and a screw each side and the planks split.... easy to replace them from underneath once it's all back in situ.
K
