Yeah, second hand 
You can but you have to make sure it has a decent amount of overlap of the heat shrink tubing.
But it’s still not as good as un-soldering the wire, heat shrink the bad area and resoldering tho
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I wouldn’t unless you use the heatshrink with the adhesive layer on the inside. Heat it to shrink then roll it between your fingers to bond it into a roll that will stay put.
Best option is always to cut off whatevers in the way, heat shrink then resolder if you can though.
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Uggghh…soldering.
Still not my strong point…
No guts, no glory. 
Just don’t use this genius’s technique unless you want to burn your fingerprints off. 
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Get some of that Liquid electrical tape if you can’t be arsed soldering.
One quick question.
Pulling the ACR apart, for a spring change.
Taken the motor out, doing the 4 screws deep in the grip, that screw the elec motor onto the gearbox…
one is now a spinner, that refuses to come out.
ive tried pulling / pushing on the box to get extra leverage…nothing.
is there an easier way to deal with these.??
Im about to go to bunnings and buy a LONG thin drill bit, to take the head off…and maybe a sausage.
any other easier way…??
Araldite on the tip of a cheapo screwdriver…??
It spins…but with some resistance…not spinning freely…
This is the worst problem with the j9/10 gearbox!
There is a nut sitting in the gearbox that the bolt goes into that is free spinning.
Sometimes if you pull the gearbox while trying to undo the screw can give enough friction to set it free… But most of the time it is drill it out 
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Yep, looks like drill time…
Good luck getting a long series drill at Bunnings… should be easy to get the sausage though.
You can always go in with a bigger and therefore longer drill bit, you really only want to drill the screw head off anyway. Then pull out the rest of the screw with pliers when the box is out of the receiver.
Replace all four nuts with newbies and lock them into the shell with a dab of epoxy so it doesn’t happen again. 
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Got my nice long drill bit…started drilling…
And the screw just spins in place!!
What now?
Drill the plastic away from the side…and lose the hole.?
Forget it.
Not coming out.
Addition to landfill.
China QC….
@Friendly_Fire …do you want the tan body pieces.?
If you can get the gearbox out, you can have the grip(3 holed retention) stock and upper…
If you want a change from black…
Sometimes drastic problems call for drastic measures!
Jam your soldering into the screw… heat and pull the f***er til it comes through!
Or just heat the nylon around the screw but that may stuff the irons tip.
There are two outcomes…
The nylon receiver melts and the gearbox comes out. Only need 3 of 4 screws anyway…
OR
Nylon also melts in the gearbox! Again, only need 3 of 4 screws!
Might need a new gearbox though?
None are great options, but I have had to resort to this once. I am not proud of it, but desperate times and such… and it all was with “approval” from the customer once situation was explained.
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I tried drilling out the plastic around the screw.
Got it a bit looser , but no dice.
After a few more attempts, I noticed some internal wiring was chewed out.
Game over for that gear box.
I then got a thick screwdriver and a hammer, and tried whacking it out, via the gears…no dice.
Result: gearbox still stuck in.
Friendly fire (or anyone else) can have the shell parts.
Melt the offending screw out, and the grip still has 3 screws.
I might look for a 2nd handy to try again on…
Some you win, some you lose…
Or….
Put it all back together, and sell it on the 2nd hand market 
Near new, minimal use, great condition…
$350 ono…
Wish I was earlier to this conversation, but was going to say the same as @RokSolid in regards to heating the screw head with the soldering iron or melting the Nylon surrounding it… also to put pressure on the housing whilst trying to unscrew is also more good advice. 
In my Business of working on 100+ year old nuts, bolts and Rivets, you certainly come across the same dilemma with old fasteners “becoming at one” with their surroundings and ending in the necessity for destruction to get them removed!
But at least it’s all metal, and there’s a 101 different tricks of the trade to deal with such issues.
Different story with Gelblasters though when dealing with Chinese plastics and Nylon, and the Soldering Iron was always the solution to be able to melt parts to remove them from wherever they had decided to make their forever homes.
My old man taught me years ago how to “Plastic Weld” Nylon using Cable Ties to repair different items, which came in VERY handy for the Gelbaster Hobby!
After all this rambling, unfortunately I don’t have any other solutions to offer, as the heating/melting technique always sorted out the issue of removal, and the Nylon Welding always fixed whatever destruction I caused.
That’s the only method to use in this instance, and if you do give up and pass it on, maybe the next person can give it a “red hot go” to get it apart. 
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If you bring it around, I’ll get that screw out for you.
Great for cleaning 30 cal bores Sempier FI Marine 
Seems something needs screwing oops