You're more than welcome mate, and helping out is what the forum is for.

Just remember, little bits at a time, one or two passes then test fit. When I pared down the cavity wall, i marked a dowel to indicate where the jack threads would end and also where the edge of the entry hole sat on the dowel. I kept paring, then replaced the dowel to gauge how much more i had to remove to engage the thread with a washer in front of the nut.

I think those jacks are stereo, but used with only a mono connection. That one looks like a shorter version, there should be some form of rubber/plastic washer behind that flange though, to help it seat securely against the bottom of the hole in the body.