Chainsaw Repair

I have bought a second hand 353 husky and it worked very well for more than a year.  Now it has blown the spark plug out of the hole and cannot tighten it back in.  It needs a heli coil or perhaps an insert.  I am not keen to buy the kit to do the job, $70  but the local chainsaw shops want to dismantle the chainsaw in order to fit the insert. This would cost too much.
What do you suggest?  I could buy a new head and fit that.  Or there are kits on line that include a 16 mm tap and insert for 14 mm plugs Can these be used without dismantling the motor.  How do you keep the metal filings from going intothe Cylinder. Any chance that a compound like muffler putty would hold the sparkplug
I am in the SW of western australia.

Just seen in Aus.  I would look at the save videos or used top myself.  Some folks have luck with aftermarket. But not a fan myself unless last choice.