I have been contemplating a different solution to this issue, but for heavy spindles on the Z axis.
I started investigating constant force springs as a solution. Here is my idea for the wall mount application (forgive the quick crude drawing). It would take a bit of creative mounting, but I could see the end attaching to the Z assembly - the other coiled end attached with bolts where the x axis motor mounts. See examples below. Correct force of spring would need to be determined. It should line up nicely with my mounting suggestions.
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