Taper Attachment SB 9 ?

woodchucker

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What's the purpose of this knurled plug? It has a cotter pin on the other side. Seems like it must be a storage location , but what's the plug do? I suspect that it might be used in the crossfeed nut bolts place when you disconnect the crossfeed, to keep swarf out of the hole, and going down. But not sure
taper_attach.jpg
 
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Mine didn't have no plug, if I remember rite it's threaded 3/8" npt. But it still works with the ta.
 
Also that hole is used to hold the collet rack , in the pic above u can't see it but that's what holds rack,
I have two of them
 
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