I found the best handle suits all detector.

[Rejy]

Can anyone guess what it's off?

 

[grubstake]

That looks like a weedeater handle to me.

 

[rocketaroo]

you have alot of eyelets there

 

[B5MECH]

Is it either a line trimmer handle or it off an exercising machine/device?

 

[Redfin]

Where is the quick track button?

 

[Rejy]

Sorry for late reply, phone cannot post replies. Yes its a weed trimer or snipper as the Australians call it, and as you pointed out the quick track button unfortunately doesn't work with this handle.