Iq 1616

[hankir]

I have almost completed.

Need 17a. Train that changes tracks (5)

By changing 24a to three words, the last letter becomes S. That makes 12d a non-word.

Also I see the 7 cells in the bottom half but it does not make the shape of the object.
I have three letters in first and second rows and one in the third row.

[ProfessorMaisie]

17 POINT

[ProfessorMaisie]

Last letter becomes E, hankir

[Neveracrossword]

17 Point, double definition

24 Changes quite easily - what it was/used to be, then its replacement .

I think your shape is right - the preamble DID say 'approximate'!

[ProfessorMaisie]

I think a 7 sided outline is possible if you're careful where you draw the lines through the numerals.

[Neveracrossword]

PM, I'm not that neat!

[ProfessorMaisie]

I'm a bit 'approximate' too, Neveracrossword.

[hankir]

Thank you ProfessorM ad NAC.

The new words at 24a are 5,5, 5. F????P????C???s.
The last word is metal object, used to toss.
It is British money so I may be wrong.

[roslyn251254]

the c and s are wrong ..should be p and e

[hankir]

Thanks ros.

Maybe it is F???Y P???E PI??E.
The word with C???S then occurs at 20D.

[Neveracrossword]

That's it, Hankir!

[Sam1960]

fifty pence piece

[Neveracrossword]

Yes, that is the thematic entry.

[hankir]

Thanks NAC and Sam

[Neveracrossword]

Hankir, glad we could help. I was leaving you to do the last tweak, I knew you had the first two words involved.