How to use the micro adjust button on Mark XVII's bracelet?

Recently acquired a bracelet for Mark XVII, but don't know how to use the Micro adjustment, Can any one illustrate it? Thanks!

Hi,

I suppose it's the same bracelet that I have on my Spitfire 387804.

You simply push the IWC-logo to extend it or just squeeze it back to shorten it. Of course, for extension it needs to first have a a correct basic adjusment having the appox 4 mm length for micro adjustment inside the clasp.

Best
/Anders