Hello and welcome to the Forum. I am a novice when it comes to these items and I know some of our old Forum folks that dealt with these extensively are unfortunately no longer with us.
However, there are still a few out there and hopefully they will respond. I must say it is an amazing hand cannon and if you did the replacement work yourself, you did an amazing job! The angled touch hole does raise a few questions. I know with thunder mugs, the touch holes that had an angled 'pocket' for the powder/fuse were because they were signal cannon meant to be placed flat against the ground, thereby making the touch hole facing upwards. This cannon appears to be a true firearm with it's larger size, so I'm not necessarily suggesting it's a "mug", but again, maybe an expert will come through on this. Anyone??