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Lights/ignition switch PSR8

Submitted by don_constable on Sun, 09/03/2014
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Heavy Twins

Hi, I have a 1960 Dommi 99 with a PSR8 Ignition/Lighting switch. On returning from a run this morning I had lost the screw which holds and works the lighting knob thingy! I have hunted through every screw I have and only found one with the right thread and it is far too short!!! The thread is very fine and, if I remember correctly, the srcew is custom made for the job. I do not want to spend 69 quid + postage to Australia for another unit...!

Any suggestions where I can get a replacement or subtitute screw?

Best wishes,

Don

Submitted by robert_tuck on Sun, 09/03/2014

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The screw has an expanding sleeve ,if this is still there are options. I have seen the screw for sale at shows/ jumbles.

Submitted by don_constable on Sun, 09/03/2014

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Sleeve and screw both departed!! Unfortunately Shows/ Jumbles are not an option in Perth, Western Australia. If I can work out the thread and, if possible, get a longer screw I may have to boge something up.

Submitted by don_constable on Sun, 09/03/2014

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I have measured the only screw I have that fits and I think the thread is 'Size 12 BSCT' which is .1135" OD and 56 threads per inch. Not common in Western Australia!!!!!

Submitted by peter_mcdermott on Sun, 09/03/2014

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G'day Don,

I think you will find the screw thread is 6BA. I lost mine off my 1960 Model50 some time ago, made do initially with a bodge of a screw and a bit of sleeve tubing before turning a one piece job as shown below.

Pete

Attachments psr8-knob-screw-jpg

Submitted by peter_mcdermott on Sun, 09/03/2014

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Previously don_constable wrote:

I have measured the only screw I have that fits and I think the thread is 'Size 12 BSCT' which is .1135" OD and 56 threads per inch. Not common in Western Australia!!!!!

In comparison to your mentioned 12g Cycle thread, 6BA is 0.1102" and 47.9 tpi, so not thatfar short; Lucas tends to be BA.

SWG Cycle thread taps and dies seem impossible to find although having recently failed within UK to find a tap to clean out the threads on some "modern" 10g spoke nipples to fit the more accurately cut original spokes on my 16H, I did finally locate and acquire one (9/64" x 40 tpi) from no less than Ebay Australia. So these thingsdo turn up in the strangest places.

Submitted by don_constable on Sun, 09/03/2014

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Thanks Paul, Bad timing for ebay part! Will contact Modak on Monday, I only lost the screw this morning.

Thanks for all the help guys, at least I have the information to chase up the part. Living in Perth Australia is great, but the distance from things can be a bind.

Don

 


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