Model Z steering damper

[saluki42]

Hi, I'm trying to find some details of my Model Zs steering damper parts. The attached are the parts that cam with the bike, the strange lump on the end is I believe the remains of the adjusting knob which was melted in the fire 40+ years ago.
Looking at a post from 29th September 2009 it appears to be the same arrangement as that used on the 36 Aero as posted by Doug. what I am missing, apart from the adjusting knob, are the friction disks.  Any information on the number of disks and any special features I should be aware of such as locating devices etc would be very helpful.

Thanks
Chris

[Ian Hand]

I will get you some photographs of mine in the next couple of days when I get home. There is a friction disc between the anchor plate and the underside of the head stem. The anchor plate has a nut welded to it so as you screw the knob down to tighten the friction disc. There is a castellated locking nut with a split pin right a the very bottom of the threaded rod. When you turn the knob the whole rod turns and increases the friction between the anchor plate and the frame.  That's a difficult thing to explain. Photos following. 

[Ian Hand]

Here are the photographs as promised.  The friction disc is made out of clutch material.. It's about 6mm thick.

[saluki42]

Thanks Ian, is that a Z1 you have there? the only real difference I can see is that the bottom plate is bent in such a way as to locate on a lug on the single down tube of the frame. I think the friction disk off of a BSA M20 should do the job nicely.
Whilst your there, if it is a model Z1 you have, how is the Lucas Magneto secured to the top of the crankcase as the none of the magnetos I have have protruding parts at the base to clamp down onto.

Chris

[Ian Hand]

Hi Chris,
Yes, I have two Z1 Powerflow bikes. They are a twin downtube frame and the steering damper bottom anchor locates on a welded nut to the cross tube under the tank.  The M20 disc should do nicely.  The magdyno has a strap which clamps it down to the top of the crank case.  There are 4 little buttons which locate in holes in the crank case and in the underside of the magdyno.
I will get some more photographs today. I have made a thin mounting plate for one of my bikes because the magdyno was slightly different.  I have found a photo of the buttons, they have a small spiggot on each side.  I hope this helps.

[saluki42]

Thanks again Ian, The buttons which came with my jigsaw of a 'Z' only have spigots on one side which I have been positioning downwards into the corresponding holes and recesses in the crankcase top surface. This then leads to the flat surfaces of the buttons abutting the bottom of the Magneto, which has no corresponding holes, and providing no resistance to sideways movement. It looks like I will need to get some double spigot buttons made and at the same time have the base of my magneto drilled to accept them, this should lead to the long strap clamp I made working as it only needs to provide a vertical force to restrain the pair.

Chris