Because somebody else would then have the same problem.
I know which bits you mean Joan, but I don't know what they're called either, they're some kind of tightener/adjuster thingies.
I'm currently perched on a really hard chair; I had no mouse this morning, so scrolling through my site was painful, and we're now modifying it. Well, I say we, John's done his coding and tick box bit so now I'm trying to go through everything page by page to amend things.