Google turned up this H-250/U repair post by Junichi Masaki, JP3DOI:

https://www.fbnews.jp/202104/ww05/

On Sat, Aug 6, 2022, 11:57 AM B. Smith <smithab11@comcast.net> wrote:
"Improvise-Adapt-Overcome"
k4che

On 8/6/2022 12:43 PM, Steve WD8DAS via Milsurplus wrote:
>
> The earphone covers were glued on but by squeezing them gently in a
> vise at several angles I was able to get the glue joint to pop and
> then I could pry the earphone cover off, exposing the element.
>
>
> Steve WD8DAS
>
> sbjohnston@aol.com
> http://www.wd8das.net/
> http://af4k-crystals.com
> --------------------------------------------------------------------
> Radio is your best entertainment value.
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>
>
>
>
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