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PostPosted: Wed Aug 23, 2017 6:46 am 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39643
Location: near Baulkham Hills, NSW
I have done many of these. Clamp it in a bench drill and drill out 9/16".
Then put the 5/8 UNF tap in the drill chuck and wind it in by hand. It will pick up the old thread remains and peel it out.
I made brass adaptors, they don't rust.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Wed Aug 23, 2017 11:16 am 
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Joined: Wed Sep 08, 2004 9:27 pm
Posts: 15870
Location: Wodonga - Vic/NSW border
drmini in aust wrote:
I made brass adaptors, they don't rust.


I use 5/8 UNF cap screws.... I don't care if they rust, I never take them out again...

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