Hi, just throwing a question if you can please help me? I just installed a hill folding clothesline post. Recommended depth is 500mm, however, I can't go deeper because I have a 100mm thick concrete that will be under the planned clothesline, which is 100mm higher than the natural ground where I want to bury the post. I only was able to bury it at 400mm. Will this hold the weight of the wet clothes or do I have to reinforce the clothesline post with something? Thanks.