Happy Birthday !!! First, I son't know a Monroe Jones in cues, sorry. Cant' help there. I will check with a friend on your shooting cue shaft, just so I am clear, let me know, it has a uni lock joint and your looking for a tip of 12.75 mm ?? or are you looking for a 11.75 mm ?? I would not change a thing on your jump cue other than practice more !!, lol.