Quentin,

I would check the weight of the boom.  The weight of a 24" piece of 
1/2" square, 1/16" wall aluminum tube should be roughly 4oz 
(113g).  If the boom weighs a lot more than that, the suggested 
spring likely wouldn't be able to support it properly.

Hope that helps.

Brett


At 09:49 PM 9/9/2010, you wrote:
>I am building the "C' Spring Seismometer but my 12" hacksaw blades 
>do not raise the boom, even with the magnet and damper not mounted. 
>Are special blades required, and if so, where can they be bought?
>
>Quentin Wagenfield


__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.