My first EC was a Trinity Collage 34 button and the buttons pushed down flush with the end plates. I them progressed through several Wheatstone EC's. So I have had this idea in my head for a very long time. That is to make the buttons push flush with the end surface. I recently saw Henrik Muller's web site where he did just that but by having new ends made. https://www.concertinajournal.org/articles/no-thumb-straps-no-finger-rests-but-it-is-an-english-a-personal-journey/   My