Rick you are absolutely correct. That was my mistake in identifying it as an insert.Unfortunately I could not edit my previous post when I identified my error
We had all 14 holes done with helicoils and as you say they are SS on the advise of the guy who does them..He travels to garages and engineering shops to do inserts and that is his business. If anyone needs a travelling engineer to do inserts give me a call and I shall pass his details.
Here he is running the tap which is the standard size and then enlarges the threads with the second size for the inserts.
Insert being screwed in
We had all 14 holes done with helicoils and as you say they are SS on the advise of the guy who does them..He travels to garages and engineering shops to do inserts and that is his business. If anyone needs a travelling engineer to do inserts give me a call and I shall pass his details.
Here he is running the tap which is the standard size and then enlarges the threads with the second size for the inserts.

Insert being screwed in
