A few months ago I bought the girly version of this bike on Amazon because it had hit an amazing price. It was fairly easy to put together, all by myself, I only needed to borrow a few tools from my boyfriend's dad and have him adjust the seat/handlebars while I sat on the bike, etc. Everything was going great until I took my first ride... and the seat started to slip, both forwards and backwards, unless I held myself perfectly level. A couple of seat wedgies later I went back home and tightened the seat with a crescent wrench, which held for maybe a half hour until... it slipped again. Subsequent adjustments with the crescent wrench have had the same effect, it holds for awhile but any strong pressure (like that of a human ass) will make the seat list forward or bend backward, which obviously does not make for good riding. I've had "big strong men" adjust it too, it's no better. I am wondering if I am missing an important seat component, but I know I didn't lose anything from the bike box. Any idea what it might be, bike mechanics? I don't see any screw holes under the seat or on the seat post. besides the bolt that holds the seat to the post.
Thanks in advance for any help you can give me. I really want to fix this myself, in fact one of the reasons I bought a disassembled bike instead of a ready-made one (besides the price) was so that I would be forced to learn how my bike works instead of just treating it like some toy. If I do have to take my bike to a shop, though, how much will it cost to fix?
I can post pictures tomorrow if you all need to see the seat to diagnose it.