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Title: serious design flaw
Review: A height adjustable threshodld is a great product, and although this one has a great finish there is a design flaw in that it depends on locking washers to support the riser. However, these washers are not strong enough to withstand the weight of an adult stepping on the riser without collapsing down to the lowest setting. Someone on homedepot.com made the same comments but I found them too late. I took the washers out and created some blocks to hold the riser up. It looks great and seals up my door perfectly when coupled with the M-D door bottom, but it is no longer and adjustable unit.
