Recently I had this exact issue with my TC V6. I went to my local watchsmith, where they did find a rivet that fit the existing TC pin, the problem was, the washer on the inside of the clasp that gives it the right amount space to clasp correctly and line all the way up. They used a hollow pin tube, that fit over the TC pin, then they cut it down to the exact size like the existing side (Still had one washer on the opposite end). They cut it down, sanded, polished, and boom it worked. If you need the washer, I could send you the left over tube they used to cut the washer.