Quoted from DocGar:Here's a little twist that I haven't seen publicized to date. There's a mini-post just to the right of the upper ball guides. On my '84 machine, it is a non-thru-hole screw type (with no sign of damage at/about the area). On surveying the same area on the CPR board, this appears to be a thru-hole for a T-nut. Anyone else seen this? How did you resolve it? Imagine a # 6 or 8 threaded mini-post does the job but wanted to hear what others have done. Tnx..
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I have seen stranger things but yes it should be a through hole mini post. I believe 8-32 thread, an external tooth lock washer and a nut. It looks like they ran out at the factory because you have the hole there but no evidence that there was a threaded post there. Perhaps someone just lazy.