PSN-L Email List Message

Subject: Re: good leveling screw source
From: "Charles R. Patton" charles.r.patton@........
Date: Mon, 17 Oct 2005 21:42:51 -0700

Roll your own from fine pitch metric screws
pkg.s of 10  M1 x0.25 (1mm) 101.5 TPI screws for $1.31 Australian..
pkgs.s of 10  M1 x0.25 (1mm) 101.5 TPI nuts for $10.84 Australian  
(about $8.25 US) or so.

So total cost $10 plus shipping or about a $1 an adjustment point.  Find 
a couple of Bellville washers and use two nuts per screw to make 
anti-backlash versions, although once the weight of the seismometer is 
on the screw, it should be pretty much anti-backlash as is. 

Charles Patton

( I started a Google search with
"80 tpi" screws
and found this in the first page of 10  of 428 returns.  So there are 
bound to be more.)



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