Section 7130 - Shaft Guides(a) All shaft guides shall be Select Douglas Fir or equivalent, and shall be large enough in cross section to absorb the shock of stopping the fall of a shaft conveyance when gripped by the safety dogs or catches.(b) Shaft guides shall be securely fastened in place with bolts or lag screws. Lag screws shall be screwed and not driven into place.Cal. Code Regs. Tit. 8, § 7130