Following on from my question yesterday (//www.diynot.com/forums/viewtopic.php?p=2046045#2046045) about gravel boards and fencing, I was wondering if someone could help me with this: I've decided to put down concrete gravel boards with existing concrete posts. However, the posts are old and do not have any holes to bolt the gravel boards to; so my question is, is it possible to instal the concrete gravel boards without bolting them to the concrete posts? Those concrete posts are heavy and I can't see why they would need to be secured. They're not going anywhere. Am I missing something? Thanks in advance.