[ATM] Conical Mirrors - central bolts?

[toolontop at yahoo.com (Mark Cowan)]

Hi Doug:

I was told not that long ago about a respected mirror 
maker (whose name escapes me, sorry) who used a
central bolt in the mirrors he made for dobsonians,
solely for the support provided.  I have no data on
how well this worked other than that he was his
preferred method.  So I suspect it can work fairly
well. For myself I'm drawn to gentler methods. ;)  

Cheers,
Mark Cowan
Salem, OR

--- Doug Williams <salguod@minbaritm.com> wrote:
<snip>
> Again, my central post (pin, whatever) would provide
> no vertical support.
> It would provide only horizontal support to keep the
> mirror from slipping
> off of the wiffle tree when the scope is pointed
> toward the horizon. <snip>  Would the
> deformation be less than what a
> sling does?  I don't know, but I think it is worth
> checking.
> 
> I still find it hard to believe that nobody has
> tried this.  <snip>

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