The quickest is a squared up 1X4 backer. Set the work against the backer, push both against the fence and then, push it through.
Everything else are variations of this set up.
You can glue the 1X to a panel, add clamps and a handle and, on and on.
'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton
Please edit your profile with a name and location so we can better assist you and make for a friendlier forum.