I've got a second hand Louet Hollandia - a large countermarche loom. There are marks on the parallel cords to show where the blocking pin should go - or used to go. It's really hard to pull those marks together to insert the blocking pin in the original position now. If I do manage it, when I take the pin out, everything just drifts. The lower lams are inclined to sit quite close to the upper lams if left to settle. The measurements from floor to top of lams are a long way from correct but even if I pull everything to where it ought to be sitting, it doesn't stay there! What's going on? How do I fix it? I'm getting inadequate shed and finding that lams are bending in the middle where they are tied - the lam ends just don't really want to travel much.