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Chockstone Forum - Gear Lust / Lost & Found

Rave About Your Rack Please do not post retail SPAM.

Topic Date User
Another weird self-drilling bolt 31-May-2011 At 9:04:23 AM kuu
Message
Hi Mikl,

That looks like a "Terrier" self-drilling expansion bolt/device.

A threaded handle screws in (where the bolt is in this example) to facilitate hand-drilling by hammering. When the hole is completed an expansion cone/plug is inserted at the toothed end and the whole gadget hammered back into the hole. The plug hits the bottom of the hole and stops moving (not so likely in sandstone?) and the outer continues to slide inwards and the sides expand to lock the whole thing into the hole. The handle is removed and replaced by a bolt, which can be a threaded ring or normal bolt as in this example.

A Terrier bolt was used on the FA of "Fuddy Duddy" (at Narrow Neck) and a number were used on the FA of "Tooth & Nail" (Boars Head). There was also one retro-placed on the "Mantleshelf" (Three Sisters).

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