Cheers, I'll have a bash. I changed the length of the bridge in the vain hope it'd still hold some of the bridge in the gap after the movement, but nein, just moves it further.
I'll have another crack now and get back.
Okay, I've tried -344, -300, -688, -700, 700, -1, -0.5
and they either go into the hole, or go way, way off into the opposite wall. I'm finding it frustrating now, erp.
okay, I managed to fix it. because of the lip you can see on the interior wall that forms part of the bridge, it was taking this into account. So I removed the lip and the bridge works as expected
cheers for your help man