That’s exactly the case. Right now there’s no 8x18650 extension tube for MF04, but I would expect this might be available in the future (all other Astrolux lights were 1:1 BLF design). I’ll try to find out.
Right now there are these new 4x18650 tubes for Astrolux MF01 / MF02 / MF04 available:
Two designs to pick the one you like better (the only difference being the appearance of the knurling) - note this is not an extension tube - just different design to change flashlight style.
Red Copper ReyLight Pineapple Mini Nichia 219C 360LM Simple Operation EDC Tactical Flashlight
Coupon code with discount is available.
» 
Request via PM here«
Upgraded ReyLight New Pineapple Nichia 219C 470LM 4Modes Memory Function EDC Tactical Flashlight
Coupon code with discount is available.
» Request via PM here«
UNI-T UT210E Multifunction AC/DC Current Mini Digital Clamp Ammeter
Use coupon code 263e8e for additional -$10 discount to get final price of $29.99
Xiaomi Mijia Wowstick Wowpad 2 Magnetic Screw Pads Position Plate Remembrance Mat Repair Tool
It’s now in flash sale discounted from $9.59 to only $2.99 (lowest yet).
Offer expires in 5 days and 5 hours.
It’s now in flash sale discounted from $85.99 to only $41.99 (–51%)
Offer expires in 5 days and 5 hours.
It the most cost effective option on the market right now – parameters are not overstated: 2 USB output ports able to deliver up to 3A of current (combined) so its able to charge any smartphone out there. It doesn’t even require full sun to charge(performance is reduced of course). The same product is sold on amazon and elsewhere under Anker 20W and Anker 21W panel if you want to search for more reviews. It’s now even cheaper than in preorder one year ago…
Folds into small book:
I got one of these. Easy to dismiss as an expensive magnet until you go to change out a part in a smartphone. There IS a difference between some of the screws in an iphone, but the difference is nearly imperceptible to my old eyes. On closer examination there are some that are 2 or 3 treads longer than the others and I suspect that the holes they go in to are not forgiving of having a longer screw being forced into them. This is a great way to keep track of original hole locations.
Also got a fancy blue project pad. After decades of working on tiny stuff that could’ve really benefited from such a surface I got one just in time to be an old man.
Some suspect those screws are different length on purpose - you destroy PCB/mainboard traces when you put one of those imperceptibly longer screws in wrong socket…
On the other hand - this is not that expansive given the size. Any magnet even quarter the size will cost much more.
Jetbeam DDR-30GT XHP70 3680LM Outdooors Long Range LED Flashlight 18650
Use coupon code 49909b to get -$90 discount.
XANES STL07 Smart Bike Tail Light Brake Sensing USB Rechargeable IPX6 Waterproof Rear Light
Newest tailight from Xanes is now in preorder for $16.99 (first 120 pcs), the price will gradually go up to a target price of $27.28.
SKILHUNT Defier X0 XM-L2 650lm Tactical LED Flashlight
Use coupon code 7ea61e to lower the price from $49.99 by to $29.99
HaikeLite MT03 II Devourer XHP70 2SPS 8760LM CW/NW High Power LED Flashlight - Cool white light
Use coupon code 7fe195 to save $27.00
Limited pieces available.
IMALENT HR20 XP-L HI 1000LM 18650 Outdoor LED Headlamp Flashlight
using coupon code 0951a7 price drops from $49.95 to $36.99 (-$12.96/-26%)
Use coupon code 489eff to get $30.69 price ($39.99)
Use coupon code d1b2f7 to get $36.69 ($42.49).
Four LED tints available: U4-7A, U6-3A, U6-4C, V2-1A
BlitzWolf® BW-AS1 Wireless Bluetooth Speaker 20W Double Driver 5200mAh Hands-free Aux-in Speaker
Use coupon code 8866d2 to get 20$ discount.
This is high quality aluminium alloy casing bluetooth speaker conceived and founded through kickstarter campaign. See product page for details and reviews.
XIAOMI Wowstick 1F+ 64 In 1 Electric Screwdriver Cordless Lithium-ion Charge LED Power Screwdriver
This set is now in flash sale for only $39.99 ( –30$ | was $69.99)
Set includes rechargeable variant electric screwdriver made of aluminium alloy (with charging base), stylish white magnetic case, 56 pcs screwdriver bits, Wowpad magnetic screw pad, other accessories (sucker, USB cable, magnetizer, screw bottle, triangular plastic spudger/pry tool) - see detailed photos and description on product page.
Offer expires in 6 days and 10 hours.
MHVAST TS50 XHP 1A/3C 2920Lumens 7Modes Dimming Super Bright LED Flashlight 18650
Use coupon code 18f492 to lower the price from $94.99 to $69.00
Use coupon code 5a7f4a to get $10.99 price.
Nitecore NBM40 Multi-purpose Portable Battery Magazine
Use coupon code 0cddc6 to get $4.99 price (-$2.00/-29%)
4 colors available: black, yellow, green and pink.