It might be worth noting that the screws (at least those in my Record vice) are not the usual 90 or 120 degree countersunk screws but have an included angle nearer to 60/75 degrees.
So if you destroy the originals you might just find it difficult to get replacements.
I would agree wholeheartedly with using the vice jaws to prevent cam out. My vice had spent many months (probably years) in a friend back garden before he gave it to me to take to the local tip – it never got there.
All parts were totally seized but succumbed to soaking in paraffin, under my bench for a couple of months
regards
B