Hi again,

Actually 
\unexpanded\def\dotlessring    #1{\tfb\normalring    {\tfx\mathdotless#1}}
has side effects, that is it induces a font switch outside the scope of \dotlessring… So it cannot be used as such in real situations, although when I test isolated instances it works fine.

Thanks again for your help: OK

On 14 Sep 2019, at 14:08, Atsuhito Kohda <atsu10.kohda@gmail.com> wrote:

Dear Otared,

Sorry for my mistake.  Of course you will need more fine tuning but
\unexpanded\def\dotlessring    #1{\tfb\normalring    {\tfx\mathdotless#1}}
might help you a bit.  But if not please ignore this.

Best regards,
Atsuhito Kohda

2019年9月14日(土) 20:51 Otared Kavian <otared@gmail.com>:

Thanks for your attention, but in fact \mathring and what you suggest, that is \dotlessring, give the same result. What I am looking for is to replace the small circle used by \mathring by a slightly bigger circle

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