Even with the diff on a bench, drilling and tapping it without a pillar drill could be a bit of a 'mare.
Yes I am worried about it... I have no other choice though if u want to fit a good diff guard as they all use them holes
 
Yes I am worried about it... I have no other choice though if u want to fit a good diff guard as they all use them holes

Could you not weld another piece to it that would go over the diff to hold it in place? Surely that would be less likely to be a worry.
 

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