TR3A spring cup guide?

["T. S. White" <tswrace@pacbell.net>]

Hi List,

I am machining a spare set of spring spacers to adjust my ride height. 
The top of the spring cup on the frame has a circular lip in it to
position the spring spacer.  If it is possible for someone that has a
frame with the suspension disassembled to measure this for me I would
like to know the height of this circular lip.  How far does this lip
extend down from the top of the spring cup?  Thanks for the help.
-- 
        Best Regards,
        Tom