Yep - it's blurry my end too.
I'm fitting (drilling prior to paint) the 3 holes for the bonnet ring found on the MK2 S.. I don't actually have the 3 plastic sockets, I can measure the pins easily enough, but the holes need to be snug enough to fit the plastic bits, but also firm enough for the die cast pins to locate as well .

Im sure someone has the correct factory size. But since i have a spare plastic insert i measured it out of interest. I'm going to say 3/16.

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1966 Mini Deluxe - “Gabby” 34 years under restoration and counting...
1970 MGBGT
1959 MGA

perfect..

FWIW, I measured my plastic inserts also and they were 4.73-4.74mm as above (12 of). A 3/16 (4.76mm) drill wont go through the holes in my original bonnet/boot easily (could force it /probably paint - most likely size). A 4.5 mm drill is "slightly" loose in the holes. The lugs on my front/rear badges vary from 3.08mm to 3.22mm (2 front badge surrounds, 3 rear badges).

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1970 Mk2 Cooper S under restoration

I have a copy of a drawing that shows the badge hole diameter is 0.140 to 0.145”, 9/64” fits in between the limits. Approx 3.6 mm.
That will likely be the hole size as body in white, some e-coat and paint film will make this smaller again.

Paul.

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1970 Morris Mini K

Do you have a clearer drawing?

My NOS Badge fixes are exactly 3/16" in diameter.

No, that's it.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

The holes on my Mk2 bonnet and bootlid are 11/64inch. The new drill bit just shaves a light cut of excess paint from the holes.

Wow ,I have learnt so much about fitting badges I am now scared to fit anything on my car. Love to see you guys fitting something difficult.
Allen

I am glad you have learnt so much. That is the great thing about this forum. It caters for all especially people like you. You don't need to be scared to fit things to your car - just ask the question if you are stuck.

Obviously gto you are not a problem solver, but that is ok they still have not resolved the problem of fitting the badges, maybe you should try and work it out but then again you are not a problem solver and you may get stumped.

Allen - Clearly your previous post and this one is a bit of tongue in cheek sarcasm, and I for one don't mind some humour, although some may not get it. You have been generous in the past by passing on your knowledge of body work and painting that I'm sure has helped other members.

You say "... they have still not resolved the problem of fitting badges". If you can assist the original poster who is clearly trying to restore his car and avoid mishaps then please describe how you would tackle the issue.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

I thought I answered the original question with a simple and straight forward reply at the start.

As it happens some other people like to ask more questions or add more info to the discussion or start a similar topic related to badges and badge placement.

I got mine done,took a while …but there was no body filler