10 Speed chain

Workshy
Workshy Posts: 4
edited October 2010 in Workshop
Hi
Having just upgraded to 10 speed shifters (105) and 10 speed cassette I noticed whilst adjusting the derailleur that there is one cog where the chain does not sit well whatever I do to the cable tension. Some research later I realise I also needed a 10 speed chain. I think this must be the problem, as the derailleur is 10 speed compatible. However it is Sunday tomorrow and I have a ride before the shops open.

Reckon it will be ok to ride for a couple of hours if I take care to avoid the cog the chain doesn't sit well on? Or will I ruin my new cassette (sram)?