Here's what I'll be using:

What we have there is a 1 1/4" brass sink drain slip extension, a TCSS MHS to 1 1/4" sink tube adapter, blade holder #14, activation box #2 (a new part!) with an illuminated anti-vandal style switch (blue dot), speaker mount v2, a 1.1", 1-watt, 8ohm speaker, a 4-AA battery holder, 4 rechargeable NiMH batteries, and a Master Replicas/Hasbro Force FX soundboard from I think, a Luke ANH FX saber, and a blue Seoul P4 high-power led.
The adapter will fit into the sink tube like this:

Then the heatsink for the led will go in there:

And then the emitter will screw into the adapter like this:

As is, this is a super long saber, so I'll be shortening the brass tube:

That's my Brass saber, and it's a little over 12" long.....this one will need to be about 10.5-11" long to look right, I think......

I'll cut it off right about there:


I marked it off at 9" .....with the addition of the adapter and blade holder, it'll be about 12" long.
I took the tube up to the garage where the compound miter saw is, and cut it off:


This will need to de-burred:

I'll use the 60 grit sanding drum on the rotary tool for this:

As I was de-burring the tube, I noticed a problem.....the "brass" coloring was coming off in flakes....I've had this same problem before with these brass tubes from the place i got this one....

I may have to order another tube, or send this one out to be powder coated in translucent gold.....I'll continue working with this one and see what happens with it.
Here's how long it is now compared my brass saber:

That looks like it should work....I can't go any shorter with it due to the space requirements of the 4-AA battery holder.
I moved on to the grips.....I used my tubing cutter method to score the tube to simulate grips:

Uh-oh....that's not good....the brass coating is coming off completely....

I added a few more scoring marks and then the coating began coming off like a ribbon:

Looks like if i use this tube, it'll definitely have to be powder coated! I peeled of almost all of the coating, then moved on to figuring out where to mount the switch box to maximize internal space:

That might work okay.....
I could move the switch box further forward and switch to a 4-AAA battery holder, too:

Or I could put it more centered on the hilt and put the sound board in front of the switch box:

This would still need the AAA battery holder.....I'd rather use AA's for the increased capacity so the saber will run longer at the Base/Garrison events.
My instincts are telling me to go with the first set up and the AA battery holder.....