Pekin Spiral Helix
Subroadbed is 1/2" homasote only, instead of homasote plus 1/2" OSB (wafer board). Loop is only 1 inch wide instead of 1.5 inches wide as on the other helixes. 16 supports were used to maintain stability instead of just 8 that were sufficient on the Bartonville, Kellar, and Peoria helixes which used both the homasote and OSB for the subroadbed.
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