Gary,

After looking at your design, I see that there was one thing I failed to 
mention.  The formula I gave for the period assumes that the distance from 
the spring to the pivot is the same as the distance of the mass from the 
pivot.  If not, the period needs to be multiplied by (mass distance / 
spring distance).  In other words, the effective value of K gets reduced by 
the square of that ratio.

Also, one set of units which will work has forces in Newtons, mass in 
kilograms, distances in meters and time in seconds.  If you convert your 
units to those, the formula should give the proper results for the period.

Regards,
Brett


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