"noxpurt" wrote in message
...
its not a stringer, but solid 18' length of 2 x 12 as a riser with nailing
blocks attached to it for the stairs to sit on.

Cut stringers and attach them to the inside of the 18' solid with some
screws or bolts.
Easy and fast. Forget making a ton-o-blocks. They will never last and the
alignment alone would take more time than cutting new stringers.

Dave