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Lucas headlamp panel screws

Submitted by eugene_brolund on Sun, 04/09/2011
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Heavy Twins

Hello Nortoneers!

I am not sure if this post should be here, or in electrical?

I need to order 3 new screws to hold down the headlamp panel on the Lucas MCH58 headlamp on my '57 model 77. I have a screw that fits the hole (but has the wrong head) it has a diameter of .155, and has a thred pitch somewhere between 34 TPI & 36 TPI (my pitch gage has no sizes between those two). I know that a5/32 CEI had a dia. of .1563 with 32 TPI & a 3BA has a diameter of .161 with 34.8 TPI. Neither of these seem to match, but I am leaning tward the 3ba as I know the 32 TPI for the CEI is not correct. The Lucas Part number is 106491 & the washer is part numer 185026. Also, can anyone tell me what shape head this screw would have?

Thanks,

Skip Brolund

Submitted by eugene_brolund on Sun, 04/09/2011

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Sorry for the double message, the first one had an error 503 code, so I assumed id didnt go through, so I reposted.

Submitted by john_whiting on Mon, 05/09/2011

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Lucas loved 3BA and used it everywhere.I think they had a slightly domed head and a wide slot.Ive seen claims that the odd no BAs were never used, obviously never owned a British motorbike.Regards John.

 


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