this would seem to bear out a lot of other 1-a owners findings. it's not so much that they need varying amounts of pressure, but rather just some CONSTANT pressure. a lot of people get good results just from driving a brass wedge between the forend hanger and the barrel - not all, of course, but enough to make it worth trying. the other issue for 1-A's seems to be the one piece quarter rib. i wouldn't do it on a hunting rifle, but good results can be had by cutting the rib - effectively making it a two piece mount.