After 3 successive orders, the bases have all three a defect of connectivity. I think the heights of the pins of the contacts are not high enough and do not fit in the header. View the photo : [image: 1572778477632-img_20191103_114636-resized.jpg]

It's M5 who has to make the changes? If not, where can I find the drawing of the changes? I am a teacher in France who wants to use your products for science education computer and I want to find practical solutions. Thank you

I didn't say it was clean, it's a workaround. You can buy grove to dupont converters. https://www.aliexpress.com/item/32801421897.html?spm=a2g0o.productlist.0.0.4612d357XRyxy0&algo_pvid=32f54ee3-80fd-47a2-8346-79292f9c97d6&algo_expid=32f54ee3-80fd-47a2-8346-79292f9c97d6-22&btsid=c43ffbaf-dfc6-4639-81cc-59bfa84bb838&ws_ab_test=searchweb0_0,searchweb201602_6,searchweb201603_52