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Headstock dimensions please

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RupertB:
Can anyone with a CB750 K2 or thereabouts do me a huge favour and measure the distance from top to bottom of the headstock please? That is to say the distance between the top and bottom yokes effectively - my Foale frame has a distance of 190mm according to my cheap tape measure - is this standard?
Reason I ask is the bottom yoke on mine is joined to the top yoke by a length of steel rod, and the top yoke has a sawn off bit of threaded metal from the original rod bolted into it.
Equally, anyone got a bottom yoke for sale?
Thanks in advance.

mick:
Hi Can you post some photos of your top & bottom yokes and the threaded bar cheers, it might help us to help you  ;), cheers Mick.

RupertB:
I've taken a few pics which should follow this post, but you will see the basic problem - I haven't got a steering stem! There's a top yoke, a bottom yoke, and a horrible metal rod which joins the top and bottom yokes with a couple of nuts and some washers, threaded through what looks like a cut off section of stem which has been stuck into the top yoke.
It has prompted a theory that someone bought a write-off K4 from America to put into the Foale frame, and a heavy frontal impact might bend a headstock and destroy a frame quite happily. That's only an idea though and doesn;t really matter.
My problem now is that I need to acquire a new bottom yoke with stem because there is no way I want to shove the old setup back in!
So I need to be sure that a new yoke and stem are right for the Foale frame. I guess they will be, but could do with some reassurance.

RupertB:
The top yoke -

RupertB:
.....and the frame headstock area.

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