magnet_v21a is the shifted verison of v20a
magnet_v21b is the shifted verison of v20b
rich_v21a is the shifted verison of v17a_1e

Shifted by 40cm consistent with the change of coordinates from
old target position to centre of the magnet.

Having seperate translation for pipe_v16c causes problems for inclusion
of MVD. Translation via node shift instead.