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The outside dia of the pin is somewhat larger than the hole in the shaft.
To install, the chamfered end is placed against the hole and pressure is applied to the other end.
The pin coils must now tighten up the reduce the OD and the pin will slide in.
In my experience, if you use a hammer the pin starts to insert but tends to bounce back. The impact does not provide enough time for the coils to tighten up.
Hitting it harder only makes this worse and will damage the pin.
A steady force from a press allows everything to happen.
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86 911 Race Car, with a few 993 bits in the boiler room
79 928 Race Car
88 928 Becoming a Race Car
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