The above suggestion will work, but before that I'd try a few well placed gooobers of PL Premium. Done correctly, the PL dries to rock hard in an hour. If they don't come loose in a week, they will be there for life. Do make sure the steps are as dust free as possible before applying the PL.
AT worst they come loose and you can do the screw down method with the old PL acting as a leveler.