  When two spacetimes are stitched across a null-shell placed at the horizon of
a black hole BMS-supertranslation like soldering freedom arises if one demands
the induced metric on the horizon shell should remain invariant under the
translations generated by the null generators of the shell. We revisit this
phenomenon at the horizon of rotating shells and obtain BMS like symmetries. We
further show that superrotation like soldering symmetries in the form of
conformal isometries can emerge whenever the degenerate metric of any null
hypersurface admits a dependency on null (degenerate direction) coordinate.
This kind of conformal isometry can also appear for a null surface situated
very close to the horizon of black holes. We also study the intrinsic
properties of different kinds of horizon shells considered in this note.
