If the switch was manufactured by Lucas, they used BA screw threads. The
closest BA screw to a M4 is a 2BA with a metric pitch of .81mm.
Greg G.
Osseo, MN
> I'm stumped on this one.
>
> The old switch is mounted to the steering column with two #8 screws. The
> old
> screws won't thread into the brand new switch. I had seen this before,
> aka
> Clutch slave cylinder where the bleed screw was metric. Confident that I
> knew
> the problem, I went to the tool room today.
>
> I just came back from the tool room, thought I found the perfect M4 screw.
> Imagine my surprise, it won't thread in either. I guess brute force is an
> answer, but have no idea whether to re-tap it metric or re-tap it SAE.
>
> What's going on here? Any suggestions?
>
>
>
> Will Daehler
> 63 TR4 Powder Blue
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