My chain-line keeps making me look stupid!

Weaving my way through a busy highstreet doing my thing when.. CLudakngak...looks down yet again my chain has impossibly wrapped itself around the cog.

The outer side of the chain is firmly against the chain ring and the untrustworthy local shop said it has to have a shorter bottom bracket..?

I have these wheels..http://www.merlincycles.com/bike-shop/wheels/road-wheels/factory-road-wheels/ultimate-hardware-700c-single-speed-wheels.html

Would it be possible to put a spacer in to move the cog about 3mm?.. or one guy said it might be possible to remove the smaller inner cog on the chain ring and replace it with the outer 48t that I use?

This is only a daily beater which is why I want a quick fix.. no quality parts will be harmed in this process.

Thanks

yeah you can get bottom brackets that have a shorter spindle. for example:

Miche Primato Track Bottom Bracket(107mm x 68mm shell, BSA)

the 107 is the total length. you need to measure yours and see if you can get a shorter one. One thing to make sure tho is that you have enough clearance inbetween the chainring and your chainstay on your frame.

I tried flipping the larger cog on the chain ring and putting it in the place of the smaller cog.. with the addition of washers it seems to have worked perfectly!