If your asking why the Cuplok scaffold you built seemed shakier than a Layher scaffold then its beacuse you built a really tall Cuplok scaffold with no braces and no tie ins. Trust me here in the States we use Cuplok and Layher systems all the time and if you built both scaffold's the same height and width w/ no braces the Cuplok would be solid as feck compared to a Pin-Lock(Layher) scaffold. Has to do with the locking mechanism's of the two material's..........BUT with that being said other than the fact Cuplok is a little bit less shakier without braces than Layher it's CRAP in every other comparible catagory. Just my 2 cents...