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wanted; SPEAKER WALL-MOUNTS(BRACKETS).
Materials handy; empty adhesive/sealant cartridges looked likely.
So here goes my first Instructable; SPEAKER BRACKETS FROM EMPTY SEALANT/ADHESIVE CARTRIDGES
$0 if screws, bolts and wall anchors are already among your bits and pieces.

Step 1: Materials and Tools Required

Materials used
empty adhesive/sealant cartridge
2 plastic bottles to fit inside cartridge
4 bolts to attach speakers to brackets(cartridge)
4 screws to attach brackets to wall

Tools you will need
pen
craftknife
drill
screwdriver
stud finder or drywall or masonary anchors depending in wall type

Step 2: VERSION 1 (the Basis for Version 2)

Cut cartridge into 2 equal lengths.
Measure the distance between the speaker bolts. Use this as measurement between holes in cartridge.
I also used this as the distance apart for the screws in the wall from which the bracket would hang.

Step 3: Diagram

The holes were the diameter of the bolt heads(speaker side of bracket[cartridge]) and screw heads(wall side of bracket)
Then slots(width of screw and bolt shaft diameters) were cut downwards from bolt holes for the speaker to hang in the slots, and upwards from the screw holes for the bracket to hang from the wall screws.

Step 4: Reason for Version 2

It turned out the 2.7Kg(6lb) Mission M30 speakers were too heavy for the cartridge thickness and ripped out of the holes.
Even with a new set of slotted holes cut in the cartridge and a slot cut in a red plastic outer(visible in picture) of a spool of thread tape which was inserted as a strengthener it is obvious perfection is some way off.

Step 5: VERSION 2

My solution was to make holes(no slots) only the shaft diameter5.9mm(15/64") of the M4 bolts to screw the bracket permanently on to the speaker.
When designing, consider how to tighten the bolts. -awkward with fingers or spanner if holes are far from open ends of of the bracket.-maybe slotted headed bolts can be accessed by screwdriver from the opposite holes.
Then made holes(no slots) the diameter of the heads of the wall screws.
I offset these holes minimally away from 180degrees opposite from the speaker holes so that the speakers would angle slightly toward the centre of the room.
I found small plastic bottles(happened to have contained garlic pills) which fitted firmly inside the cartridge. Cut the bottles in two (around the circumference). In each half of the bottle cut a slot to fit around the shaft of the wall screw and a cut-out opposite the slot so the speaker bolt will not interfere with the bottle being pushed into the cartridge.

Step 6: Fit Speaker to Bracket to Wall

These half-bottles acted as strengthening inner-sleeves, and when pushed into place held the bracket to the wall.
picture shows inner-sleeve slots aligned with holes. Ready to slip around wall screw shafts
Make holes in the bottom of the bottles to help with extracting them when you want to detach the speakers from the wall.

Step 7: CONCLUSION

These brackets are doing the job so will stay as is.
However using a stronger plastic pipe(instead of cartridges), or fitting the strengthening inner-sleeves first, might enable the original "hole & slot" design to be strong enough, and therefore more easily fitted & detached from the wall & speakers.
Maybe splitting each bracket into 2 pieces(or making them telescopic) might allow them to be "universal" for speakers with different measurements between mounting holes.
And those with more patience and acoustic knowledge than I have might know if different diameters/lengths would enhance sound by attenuating/enhancing frequencies.

AND FOR THE BRAVE:- TRY IT ON YOUR FLATSCREEN TV!!

-second thoughts and disclaimer: Try at your own risk. I have not tried this. Use strong lengths of pipe, extreme care, and common sense.

Nice. You could use PVC pipes... :D
I agree. If you have them in the right size. They'd probably be stronger and wouldn't need extra strengthening. Thanks for comment.

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