Firstly, these inserts vary heaps in quality! The best inserts I've found where at power tools plus. 20c ea for a 6mm Insert.
Knurling is very important to gain grip from spinning after setting. Power tools plus brand had knurling on both horizontal and vertical faces.
The inserts you get in the kit....... honestly throw them out!
The amount of grip width varies in brands as well. The amount of mushroom (contact to parental metal) , tool kings/ Robbos range where terrible for this.
The pilot hole must be PRECISE!!!!
As the grip width/mushrooming of the inserts is fine. Keep it a tight fit!
Apply a tiny bit of lube to the mandrel bolt (you get different sizes in the kit, 3,4, 5, 6mm etc)
No I instructions come with the kit!!! Grrrrr
Select the mandrel size you want to use.
Seperate the outer collar from the bolt drive piece.
Screw in the bolt driver, LEFT HAND THREAD! Then tighten with spanner supplied.
Now screw the outer collar on, LEFT HAND THREAD.
Open up the arms of the gun, screw the insert all the way.
Keep good flat contact whilst compressing.
It may or may not be done in one compression, you will notice a click and the arms as if the cams become relaxed. Very simular to a rivit gun.
Except the gun dose not detach after setting the insert.
If it dose not set in the first compression, you must turn the rear knob (between the arms) clockwise to deepen the bolt into the insert , thus removing the air gap created between the insert and tool.
Keep tool alignment whilst doing so.
Now what your MEANT to be able to do is open the arms and undo the bolt in the insert by turning the knob anti clockwise, grrrrrr.
I used about 40 m6 inserts, vice grips at first.......
Then I removed the knob, a very undersized grub screw.
And welded a spark plug socket onto it, that had a 3/8 drive.
Now I just use my cordless drill with a 3/8 driver on it to wind it out.
Once out, you MUST remove the swarf from the thread of the mandrel bolt.
Simply keep the drill attached and stick your thumb nail in the thread and wind it out.
It looks like a spring and very fine. But leaving it there will only accumulate and give you greif later.
Some of this swarf fine hair stuff will stay in the insert!
I highly recommend you put a 6mm tap in a cordless in simply zip it in and out to remove it.
Use a HS tap ((high speed) , straight in and out is fine. No need to work it back and forth. But set the clutch on the drill to mild in case there is an issue.