Can anyone confirm the thread of the screws used to retain the switch panel to a Lucas DU42 headlamp...I recall it is 3BA but I'm not sure....Ian

email (option): ian@wright52.plus.com

3BA x 21/64" according to a 1948 Lucas parts manual. Good luck in finding some off the shelf - I think you'll need it!

ChrisJ

Thanks Chris...They're out there somewhere... ...Ian

email (option): ian@wright52.plus.com

Yes 3BA, and there is a bloke selling all BA sizes in S/S at Stafford every year. He's in the last corner hall next to the Bonham's auction hall. Go through the door, turn left past Jeff the rubber man and he's in the corner. Leon and Henk will know him.

Ron

email (option): ronpier@talk21.com

Thanks Ron...I know the chap your talking about...I'll make sure I get to him at some point...Ian

email (option): ian@wright52.plus.com

Hi Ian,

The lucas part No. of this screw is: 186130

http://www.brightsparkmagnetos.com/library/Parts%20lists/Lucas%20motor%20cycle%20parts%201936-57/H04-39%20Headlamps.pdf

I was able to find (Not easy.. ) that BMH TRADING has
"Headlamp panel screw, self tapping, Lucas headlight ea"
"Headlamp / headlight panel screw, self tapping, Lucas. Used for headlights where threaded hole not used in shell on eg SSU700 series, MU42
Original Lucas number:
186130 - screw"

http://www.bmhstore.bmh.com.au/index.php?main_page=product_info&cPath=4_87&products_id=1713

If that helps..
Noam.

email (option): noam10@gmail.com

Well a self tapping screw could be used, but certainly not correct for our DU headlamps. Ron

email (option): ronpier@talk21.com

Yes Ron, I agree.

I thought that since this is the only one I could find with the correct Part No,
Maybe the head shape and the thread are correct, and if there is a "drill"
On the tip of the screw, it could be cut off.
The other difference is usually a notch along the thread.

Noam.

email (option): noam10@gmail.com

If you have the 'threaded' headlamp shell and your not too fussy about absolute precision, you can use a 4mm screw...They work OK...

I've done it myself but I don't condone such irresponsible behaviour... ...

That's why I'm after the correct fastener...Ian

email (option): ian@wright52.plus.com

I used slotted brass 3BA screws in my latest one, get them easy off ebay. Got some spare if you need some.
My M20 headlamp inserts were shot so I knocked them out and put No6 UNC rivnuts in, easy choice of screws available then.

email (option): rbrouard@guernsey.net