I have an LPL 7450 and had the same problem and solved it by removing the base board and building a platform on the bench and fixed the column to that. The easel slides beneath the platform when I need to make bigger prints. I've posted a photograph of the arrangement in the non-gallery pictures section. The arrangement is a bit Heath Robinson but it works luckily the LPL is just about redundant now as I used it only for colour and I have a Zone VI enlarger that has a sloping column.