I am trying to replace the injector nozzles today, but absolutely cannot get the injectors open. I have only one bench vise available but it's too small and slides around on the bench when force is put to the injectors. I can wait until tomorrow when someone I know is at his shop with a stronger vise, or I thought I would ask here in case someone happens to have their own little strategy for opening them. By the way I tried whacking the wrench with a rubber mallot as suggested on dieselgiant, but to no avail.

Many thanks in advance,
Geoff

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1981 300SD, odometer stopped at 188,000