ETA - the base mount is an "AK" style, not an "SVD" style mount. The square one. Each riser has two screws recessed into the risers that mount to the base.
Upon further inspection, there appears to be an alignment pin on each of the risers. I'd have to remove those, then file the horizontal surface on the rear riser to raise the rear and make it point further upward.
I am pretty sure that they secure this not with loctite, but rubber cement or perhaps hot glue. That certainly isn't a loctite kind of adhesive!