For me, both as a 56 year old lifelong rider, and a professional auto/truck mechanic for 32 years (now disabled/retired) I have always seen the Enfield as a do it yourself bike. I would have gotten that nut somewhere else (it would have probably have been better quality) and fabricated my own bracket. I replaced my battery with a sealed AGM type, but have not done anything with the trouble prone cables yet. Rather than replace just the end, I plan on replacing both cables with some from a Japanese bike. I believe there are a lot of mechanical/electrical things on the Enfield that can be made better.
Glad to hear you got it going again. I rode mine about 150 miles this morning, and had a blast. Whether it will go faster or not, I prefer to ride in the 55-60 range. That seems to be it's sweet spot, where the sound and vibration levels are just about perfect. Any faster and the rpm kills the sound. Even Harleys don't sound all that great at high speed. I love that "thump thump thump" sound that goes away at higher speeds. But as I've said before, the Enfield is strictly a recreational toy for me.