John, I found one, 1/2-20 NF, made by Threadwell, top quality, 6 inches
long. Bottoming.
Let me know if you want it.
Thanks, Bill
----- Original Message -----
From: "John Styduhar" <johnstydo@gmail.com>
To: "Triumph 'Friends of Triumph" <fot@autox.team.net>
Sent: Wednesday, January 08, 2014 9:46 AM
Subject: [Fot] Extended bottoming tap for TR4 engine
> Does anyone have a tool source for a 1/2-13 extended bottoming tap to
> reach
> the four deep head studs on the TR4 pot? Looks like at least 6" OAL.
> Any comments on the value of bottom-tapping blind holes to improve stud
> holding? Thanks
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