In a message dated 08/06/2008, jamesridout@.............. writes:

The followin link is a picture of the top mount on my newly constructed  mini 
lehman, it is a 5/16" dia st/st ball bearing against a (used) tungsten  
carbide lathe tool insert. The ball sits in a steel washer soldered to two  wire 
crimp connectors, with carbon fibre support wires for the boom. The  bottom 
mount (at the end of the boom) is the same arrangement, and seems to  work very 
well!.
           James
 
_http://www.freewebs.com/jridout/apps/photos/photo.jsp?photoID=7080079_ 
(http://www.freewebs.com/jridout/apps/photos/photo.jsp?photoID=7080079) 



Hi James,
 
    Very nice! 
    If you ever need remake the bearing, I suggest that  you put the ball on 
the frame and the counterplate on the arm! 
    If you do it this way, the axis of rotation stays  constant through the 
centre-line of the balls and this is determined by the  frame settings, so you 
can easily dismount the arm make any alterations etc,  remount it and it will 
still be ~ in balance. This just makes  the operational setup just a bit 
easier. Also, if you do get a large quake  and the bearing moves slightly, it will 
stay in adjustment.
    With your arrangement, you will need to set up the  cross balance ~ from 
scratch each time you replace the ball on the  flat. 
    For the mounting the support wires, I use nylon  coated SS fishing trace 
~30 to 60 lbs. I make loops at the ends and use the  crimp tubes supplied to 
clamp the loops. This seems to work  very well.
    I hope that it all works well!
 
    Regards,
 
    Chris Chapman



   






In a message dated 08/06/2008, jamesridout@.............. writes:
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>
  
The followin link is a picture of the top mount on my newly construct=
ed=20
  mini lehman, it is a 5/16" dia st/st ball bearing against a (used) tungste=
n=20
  carbide lathe tool insert. The ball sits in a steel washer soldered to two=
=20
  wire crimp connectors, with carbon fibre support wires for the boom. The=20
  bottom mount (at the end of the boom) is the same arrangement, and seems t=
o=20
  work very well!.
  
           James
  
 
  
http://www.freewebs.com/jridout/apps/photos/photo.jsp?photoID=3D70800=
79

Hi James,
 
    Very nice! 
    If you ever need remake the bearing, I suggest=20=
that=20
you put the ball on the frame and the counterplate on the arm! 
    If you do it this way, the axis of rotation sta=
ys=20
constant through the centre-line of the balls and this is determined by the=20
frame settings, so you can easily dismount the arm make any alterations etc,=
=20
remount it and it will still be ~ in balance. This just makes=20
the operational setup just a bit easier. Also, if you do get a large qu=
ake=20
and the bearing moves slightly, it will stay in adjustment.
    With your arrangement, you will need to set up=20=
the=20
cross balance ~ from scratch each time you replace the ball on the=20
flat. 
    For the mounting the support wires, I use nylon=
=20
coated SS fishing trace ~30 to 60 lbs. I make loops at the ends and use the=20
crimp tubes supplied to clamp the loops. This seems to work=20
very well.
    I hope that it all works well!
 
    Regards,
 
    Chris Chapman