Drill holes in very tight space


I need to drill a couple of holes in a very tight space. Material is stainless steel and shape is "Π".

I need to drill one hole on each inner wall to attach a springbar on it but it can't be done with a normal drill. Any suggestions would be appreciated.

I am attaching a couple of pictures to make understanding easier.
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Best Answer

Find someone with a dentist drill. Should have a small enough head to fit in your space.