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[robson]

Be careful with the first small drill bit I did this and broke the bit when almost through then had the problem of getting the broken bit out.

[birdman]

Seeing as it`s a sump guard (rather than a precision component): would not a simple re-boring of the hole (into the broken stud) and re-threading (using a 'bottoming' tap), be enough to re secure the offending item?

ditch the gaurd i say

[Bionic]

 
DO not ditch the guard, it is there for a reason!
I have seen to many of these in my long career and by trial and error over those years found that this way works best.
Your best bet is to get hold of a set of high quality (el cheapos are total crap that will let you down) easy outs and use the correct drill size and easy out to suit the broken stud. Use a high grade centre pop to heavily mark the centre of the broken stud. Always work from it being cold and use a high quality Cobalt drill and drill slowly at 90 degrees to it with only enough pressure to keep the drill bit biting. Once done apply loads of WD or similar and screw in the Easy out using a 'T' type thread cutting tap holder.
Patience is the key word....
GudLuk

[robson]

A little confused about the cold bit and drilling at 90 degrees.

[dad1uk]

A 'plug' tap Debs?

  My bathroom`s got both!

In the posh new house with central heating