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How to remove stem from this movement?


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I want to clean some dust on the crystal and couldnt figure how to remove the stem... the little hole to the left of  crown when looking up,  feels like a release button when crown is on winding position, when pulled to time setting position it doesnt feel springy anymore... anyone can help me here? Is that the right release button?

its an old yashica king diver..

thank you

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That's a Ronda 1221. Are the other crowns cosmetic? I don't see the stems for those. In any case, there isn't much "springiness" to the release for these. Push here....might need extra pressure.

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Thank you very much! I wasnt pressing hard enough in fear of messing the keyless! But now i pressed it like there is no tomorrow lol.... managed to get it out and clean the crystal amd blow the specks... now its shining...

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