Your belt looks pretty seamless to me! Nice work!
Really surprised that they wouldn’t send you the drill start adapter; I mean, at least 1 (or probably at least 2) existed… we saw the pic! Haha
Your results are encouraging. I keep seeing in my mind’s eye, an old guy I knew who flew a four stroke is on gas. Crank once around while choked, switch on ignition, and flip the prop. One time and it ran, about a 22 inch wood prop, bare hand flip. I had a G 38 about the same. As boring as electric, so reliable. I think these can get there, especially after a bit of breakin and familiarization with tuning. It’s a classic design.