All there is on the firewall is a recess and a hole. The shaft goes through the spring, through the bushing into the hole. The shaft gets pushed further through the hole until it can be similarly inserted into the cast aluminum recess on the intake. The manifold end has a bracket that grips the boss on the manifold if the shaft tried to move backwards.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician