https://www.amazon.com/Etekcity-Portable-Camping-Flashlights-Batteries/dp/B00XM8HTIS/
I haven't done it myself, but I'm 90% sure that's the flashlight people use. It's a white label product, so you'll see a few different brands on it.
With the upper sleeve in upside down stuck to the emitter you're going to have to just work on it until it comes loose. If you're worried about breaking something you could order something like this Rubber Strap Wrench set on Amazon.
When you reinstall the upper and lower sleeves make sure that the thick bands are pointing towards the center of the hilt / towards the switch. Then if you ever want to swap the crystal in the future you leave the emitter and the pommel on and just unscrew the sleeves. There is enough play for you to take the switch halves off and remove the Kyber crystal.
Replacement power cables are 1.25mm "JST" or "PICO BLADE" connectors. The wire should be 150mm in length. Below are unaffiliated links to a couple examples, but please note that the red and black wires are reversed. This means you'd either need to solder the wires in backwards, or you would need to swap the pins on the connectors.
https://www.amazon.com/dp/B07JJ4Y3DL/ https://www.amazon.com/dp/B081V3V9HT/
YYST Clear Light saber Wall Mount Wall Rack Wall Holder - Hardware Included. https://www.amazon.com/dp/B07F58LXFP/ref=cm_sw_r_cp_api_glt_fabc_8VQWEQM7HGFAKRHK17P4?_encoding=UTF8&psc=1
I picked this one up to display in my sons room. No issues and it’s been up a few months.
TOFL Genuine Top-Grain Leather Strap | 72 Inches Long | 1/2 Inch Wide | 1/8 Inch Thick (7-8 oz) | 1 Leather Strip for DIY Arts & Craft Projects, Clothing, Jewelry, Wrapping | Medium Brown https://www.amazon.com/dp/B01FOSJ8ZU/ref=cm_sw_r_cp_api_glt_fabc_30MMWG0Y8DWT7EZHN928?_encoding=UTF8&psc=1
amazon , there’s a wooden insert for where the neck of a bottle would rest, I used rubbing alcohol to weaken the wood glue, and rocked the piece out.
Thanks! I got this box from Amazon and modified it: Wooden Wine Box - Single Wine Bottle Wood Storage Gift Case, Hinged with Clasp Box for Birthday Party, Housewarming, Wedding, Anniversary, 14 x 4.125 x 4.125 Inches https://www.amazon.com/dp/B07CV9CD1N/ref=cm_sw_r_cp_api_i_jhzpEb6MJ1EH9
Sorry...I went with the $60 model from Amazon. I had seen reviews of people indicating that the less expensive models didn't work and were difficult to return so figured I'd just go with a proven one. It worked perfectly so if you have to go over budget, you can be confident in this one:
https://www.amazon.com/gp/product/B07VB46289/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
I got it from Amazon -
Allgala Wooden Wine Bottle Box with Antique Finish https://www.amazon.com/dp/B06XMRFQ6Q/ref=cm_sw_r_cp_api_i_sP0kEbXX1GNXC
It has a small divider in it that can be easily slid out of its placement and removed.
I bought a block of green foam from the flower arrangement section of Hobby Lobby to go in it, I had to cut it to size and scoop out a dip so the saber would nestle in there and not roll off, and draped a thin layer of black velvet cloth over it.
To hold your hilt securely and put padding around it. That way blades in long pouch, hilt disconnected, makes it smaller.
Let me get you an amazon link to the one I found. It is 13" where most are shorter. This fits the whole Savi hilt in the pouch and has a buckle secured top for full protection. It's not coming out. I've flown to Japan, Europe, and back again using this. No issues.
Savi Hilt carrying pouch - recommended and used by many on the discord server.
Get a shotgun sheath from Amazon. I have one and it fits both my Savi saber and Ultrasaber plus spare blades for each. Very good quality. IIRC, this is the one I have: