Play in rear wheel

Hi,
I have a boardman team FS and noticed this evening that there's some play in the rear wheel. A couple of weeks ago I changed the hanger. The one the gave me wasn;t exactly the same as the old one but seemed to fit okay so I don't think it's that.
I took the wheel out and there seems to be a cone-shaped thing on the hub (disc side) which had a fair bit of play - side-to-side play and in and out if that makes sense - could it be that?
Bike seems to ride okayish - seems to slip the occasional gear but rarely.
Any help would be appreciated. Apologies for the non-technical terminology but I'm learning it as I encounter problem by problem lol.
des
I have a boardman team FS and noticed this evening that there's some play in the rear wheel. A couple of weeks ago I changed the hanger. The one the gave me wasn;t exactly the same as the old one but seemed to fit okay so I don't think it's that.
I took the wheel out and there seems to be a cone-shaped thing on the hub (disc side) which had a fair bit of play - side-to-side play and in and out if that makes sense - could it be that?
Bike seems to ride okayish - seems to slip the occasional gear but rarely.
Any help would be appreciated. Apologies for the non-technical terminology but I'm learning it as I encounter problem by problem lol.
des
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There is no secret ingredient - Kung Fu Panda
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Parktools
http://www.parktool.com/blog/repair-hel ... adjustment
My team fs did the same a few months ago but was convinced the bike had sealed bearings but it didn't.
You'll probably need to whack some grease in whilst your in there but check its not full of really dirty grease. I picked the bearings out and cleaned it all out and then packed it full of grease. Good as gold since
BOARDMAN TEAM FS - NOW GONE
NUKEPROOF MEGA TR 275 COMP
YT INDUSTRIES CAPRA
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
BOARDMAN TEAM FS - NOW GONE
NUKEPROOF MEGA TR 275 COMP
YT INDUSTRIES CAPRA
Another issue with the bike is a piston that I can't fully retracted back but the brakes are 100% at the minute so I'm going to leave it for now.
Cheers for the advice guys.