Thread thread - M7 x .5 tap type?

[Vapaneezer Scrooge]

Spent 4 hours fault finding and managed to fix an Wismec RX2 Jaybo 20700, I was feeling pretty chuffed with myself I popped it back together only to find the 510 thread is cross threaded near the top

I've tried all I can to clean the thread but I need a tap.

Found one on fleabay but not sure which to get, my options are:
Plug
2nd
Taper

Leaning towards the PLUG as it looks useful for cleaning up threads, I can strip down the mod again to get a clear hole but I know some mods can be a bitch to get a clear bore.

So I'm after experienced advice which will be most useful?

The 2nd tap looks more useful but not sure if it will bite on a cross threaded connector?

 

[bellyman]

I have a 510 tap and you could retap the thread but it would still be crossed.
Why not just swap the 510?

 

[Vapaneezer Scrooge]

Cheers bellyman
It's only the 1st thread that's cross threaded, tapping from the underside will sort it, but found another alternative.

I have a 2nd RX2 that was beyond saving I used as a donor for the fixed one, just stripped that and managed to knock out the press fit 510, hopefully I can swap them over.

 

[mick brown]

If you've got a blind hole and need to thread to the bottom, you've no option but to get the plug tap. It's a fine thread so should be easy to chase. Otherwise a "second" tap is more useful.