butt plate clips loose

[Philip Jamison]

I'm plagued by an Aeolian upright which has 2 broken tongues on the
brass butt rail. These were repaired by the "T"-shaped clips and held
for some years. For some reason, they now keep working themselves off
(may be the new pianist; it's in a restaurant). I tried a little thick
super glue; they held about 4 weeks. I thought to try soldering next,
but feel the rail may just dissipate the heat. Any ideas short of
replacing the rail?

Philip Jamison
West Chester, PA