Spacers & track hub

I currently am running a Sugino RD chainset that sits at 45mm with a 103 bb. If I put the chainring on the inside of the spider, the chainring grazes the chainstay. I figure I need a 3mm spacer on the rear hub for a straight chainline since the rear wheel seems to be about 42mm.

how exactly would one install a spacer on a rear hub? I have never done this before nor have I seen firsthand anyone else do it. what is the process? thanks.

All depends what hub you have. Can usually get 3mm by playing around with different widths of cone nuts, washers etc,. Just need to somehow make the right hand side has 3mm less of nuts/washers/cone and just add that 3mm to the left hand side. Difficult to help without seeing the hub. Would then need to get the spoke key out and move the rim across 3mm.

Or an easier way is to space the cog by putting some bottom bracket spacers on before screwing the cog on but 3mm is a fair bit of the thread and may not leave enough for the cog or maybe the lockring.

well to say "it is about 42mm" is not very accurate is it? we are talking 3mm, so you need to be more precise. i have never spaced a cog out, but 3mm does sound like a lot, but you could probably get away with a 2mm spacer, 1mm diff is fuck all.

spacers available from here http://velosolo.co.uk/shoptrack.html

Stick a couple of 1mm spacers on and you should be OK. I've run my Flyer like this for 2 years with no problems.
You can see a picture here.
http://farm2.static.flickr.com/1413/1336818041_f9013a3b72_o.jpg
I used the spacers from velosolo as posted above.

You should be able to run this no problems. I did for a while with no issues.

Or just buy a goldtec rear hub?!

I've encountered exactly the same problem as you Olo.
There seem to be mixed opinions as to whether a Sugino RD/103mm BB combo gives a 42mm or a 45mm chainline. Having built up a rear wheel using a System-Ex hub giving a 42mm chainline, my Sugino RD now sits out at 45mm.
Has anyone here placed 2mm worth of spacers behind a Surly Sprocket using a System Ex hub and had any problems? This may well cure my woes.