Holding vice to table advice

[mekanik]

OK
What you need is some substantial flat bar (4 off) say 25mm wide and about 10mm thick and about 50mm long,
if the slot in your vice is less than 10mm wide you will need to machine the end of the bar so it will fully engage in the slot. you now need a hole in the bars for your "T" studs, say 20mm from the end of the bar that locates in the vice slot.
You can now either add packing a tad higher than the hieght of the vice slot from the table, and with a nut on your "T" stud just tighten, you could also drill and tap the other end of the bars 10mm and jack it that way but don't forget packing on you milling table.
Regards
Mike