Chris Carruth wrote:
Redid sloppy contractor work...door jam light switch...exisitng split in
wood starts at switch screw and then slopes to edge..no way to clamp, wood
split is too small for screws..thought of using finishing brad(s) but afraid
it will split more...any suggestions?

Whether screw or nail
predrill and it will not fail.

There's always a way to clamp. Sometimes a spring board can be used -
basically a board that is slightly longer than the distance from the
surface to be clamped to the closest, perpendicularly opposed immovable
object. That could be the opposite side of the door frame or the floor
if the switch is located on the interior face of the jamb.

The real trick is getting a sufficient quantity of glue into the split.
Sometimes you have to open it up more with a razor knife and work the
glue in before taping it tightly back into place and/or clamping.

R