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For the price this really is good value. Saved the alloy cylinder head on an old engine. The only reason I haven't given five stars is that the accompanying tap is of poor quality. However it was overall a fiver well spent.
Verified purchase: Yes | Condition: New
This product is suitable only for low power, engines, with easily removable cylinder heads (motorcycles, garden equipment). The reamer head is too large for it to be inserted into a car engine (head is for a 22mm socket). There was also redrilling of the hole required (the reamer woud not catch on). Finnally, this is not a helicoil design, and will not upgrade your spark plug thread. It is just an insert with thread on the inside and outside (does not make the thread more durable). The quality is poor aswell, I was able to use 3 out of 4 inserts, cause the last one had stripped thread on the ouside. If you want an upgrade, use this instead (I have not tested this): 112018997418
Verified purchase: Yes | Condition: New
Found it worked very well on aluminium engine head and the inserts worked as they should. However, this should be treated as a tap which required the existing hole to be opened up using a drill or reamer first. This allows the tap to work properly and will cut the new thread for the insert. It will not work if you just try and cut direct into the existing thread particularly if the hole is over 8mm deep. I am a retired qualified engineer so speak with some experience.
Verified purchase: Yes | Condition: New
Super kit for aluminium, done a brilliant job, the tap might be a bit lightweight for cast iron
Verified purchase: Yes | Condition: New
When I unscrew the sparkplug the insert is still attached to the sparkplug. There is no problem with that, but there might be a problem when I change the sparkplug and try to unscrew the insert from the sparkplug to be replaced, and screw it onto the new sparkplug.
Verified purchase: Yes | Condition: New
