Hey, that's my bike! If anyone wants to do this the right way, I have a spare NOS Deore 175mm 110BCD tandem crankset with 38T ring. It matches the one in the picture above. They show up from time to time on Ebay. PM me & I'm sure we can make a deal... BTW, that bike has a TomiCog on it now. The holes elongated on the cog I made (pictured).