Not a bad effort for 2 nights' work! Everything can be period 4 except for arm 10 which needs to twist after turning (hence the title)! Not enough space anywhere for another arm to separately twist after arm 10 turns as all space is required by either the product or other arms... I cannot see a way but maybe there is - I look forward to seeing the way if it exists!

But min height and suspected theoretical min+1 period (3 can't be possible within 4 height, surely...?) - not bad for me! How many others got these values or better out of the 50 submitters though? 40?