here's the prob... trying to make a bike with vertical drops out into a single speed. i have a 38 tooth ring up front and a 16 tooth cog in the back. i've tried it with some crappy singleator imitation that i got from Nashbar but it's not working because i can't change the spring tension in the singleator. i think the tensioner spring is broken or something. so, i've tried to remove a couple of links in the chain and not use the tensioner but that makes the chain too tight to insert the rear axle into the drop outs. i'm about ready to get the Dremel out and make my own horizontal drop outs and solve the problem real quick-like . but before i do that i was hoping someone else had run into the same issue and had a good solution. also, just to let everyone know i also have a 15 and a 13 tooth cog to try on the rear. would that possibly work without making the gearing too low? any thoughts or advise would be much appreciated

thanks much