When I saw the Infuzed spliced Kielwood shafts, I thought it would be worth a try, as it would give me back the feel but still be very low deflection. It arrived this morning, and due to my main cue with the Revo being a 3/8-10 modified pin, I had to use the Infuzed on my old favorite player, a Varney custom with regular 3/8-10 pin. It's a 12.5mm shaft, btw.
There are two types of InFuze shafts:
1. Spliced maple - 10 pieces of maple, similar to the Predator 314/Z shafts
2. Kielwood - this a solid piece of torrefied maple
If you got the spliced shaft then it's not kielwood or if you got the kielwood then it's not spliced.
Both shafts are cored with a carbon fiber rod at the front end of the shafts, that's the idea behind the InFuze
I wonder why the shaft doesn't fit your modified 3/8x10 cue, most after market shafts tap the threads in a way that it would fit. Have you tried to screw it on the other butt?
I have a Rhino CF shaft with 3/8x10 threads that fitted some of my 3/8x10 modified butts but some didn't fit, I tapped it myself to get it looser and it fits them all now.
What's the weight of the shaft?
I got mine with 5/16x14 joint and it's 4.3oz which is too heavy for me