I really wanted more like 3/16" to a 1/4" in groove as you said. But my friend set it up and had it cut before I added any input. At that point I didn't want to get picky about it. I have lot's of 1/4" rod and can play and play. The end run on this may be just cut the rod flush at the black mark. When it emerges from the end of the tube it's level. Simple. But for now it looks kind of fancy, white, multi-color and when I show it off there is something going on there. But a flush indicator is where I may end up with all this. But I'm having fun and sharing for everyone to choose what works best for them.
Thanks for your comment and idea "Doofy".
Lisa
Lisa, The guide on my XR3135 is also the rod and tube type and is flush when the bucket is level. Yours is waay cooler! HaHa