06-03-13, 05:57 PM
Thanks for all the suggestions folks. I went to take the downpipes off earlier, hoping I wouldn't have to take the rad off (which I didn't), and thinking I'd have one last go at getting the tap out with what I had before taking it into an engineer. Having the offending hole (*cough*) facing up and easily accessible (oo er) made it a lot easier. I managed to drill and break up the tap, and finally got the right sized hole redrilled. Then I threaded it (very carefully) with another tap, and it's now fixed!
Lesson learned? Be very careful using cheap taps. It's a set I got from B&Q for very little, and I think in future I'll be getting better quality taps from a specialist when I need to thread holes. Not worth the hassle using cheapo acme tools.
Lesson learned? Be very careful using cheap taps. It's a set I got from B&Q for very little, and I think in future I'll be getting better quality taps from a specialist when I need to thread holes. Not worth the hassle using cheapo acme tools.