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Hi guys. Please can you help me with my headset (as I don't know what I'm doing).
I've got a 2014 Genesis Equilibrium bike. The headset has been loose (I think that's right to say), in that, the fork wobbles a bit inside the frame.
The headset is an FSA TH-857 (I'm reasonably sure it is). I'm not sure if I've got the bits the right way round in it. To be honest I'm not totally sure what goes where. I see there are manuals on the FSA website but I can't find this model listed there.
In one of the bearings, some of the balls have fallen out.
Should I buy a new headset? If so, do I need to get the same one? I think I need a traditional 1 1/8 headset, but how do I know what fits? I see the FSA TH-857 is for sale on various websites, but oddly it's not on Wiggle. I thought all the main stuff was on Wiggle?
Can anyone give me some pointers, or tell me what to do. I've watched a couple of Youtube videos, but I'm not that much wiser.
Thanks very much!
Do you have the balls that have dropped out? Are the cages intact enough to hold them in if you put them back? Getting the bus in the right order should be easy enough. If your unsure add a photo here of all the parts and we can try and help.

It's not a particularly fancy headset. If you replaced the only reason to go with the same one would be of you didn't want to swap the cups over. Otherwise if be more tempted by something with cartridge bearings. Any 1 1/8th headset should fit.