This is an old one, but my 20 year old is coming home from college for Christmas, and I would like to surprise him. I am looking for a 1/2" nylon toothed gear. I think it has a shaft on each side of the gear. All the teeth are there, so I think it has something to do with the shaft. I am hoping someone has an old Tiger sitting around that doesn't work anymore and can be cannibalized. My son got this boat when he was about 12 and it ran up until about 2 years ago. This is his favorite boat...can anyone help me, please?