The Allen key on the right side of the frame is used to tighten or loosen the bolt (threaded part). Use an Allen key on the left side of the frame to hold the knurled nut secure so it doesn’t move. You will need 2 x 5mm Allen keys to tighten or loosen the bolt in the frame. I fit the nut to the left side of the frame on My Colnago Master, and insert the washer and bolt on the right side of the frame. When fitting the part, you will notice the nut has a knurled end. If the seat post is the correct diameter for your frame, you shouldn’t need to overtighten this bolt. Fitting & MaterialsĪccording a 1981 UK retailer catalogue I found online, the bolt is made from chrome steel, but you need to be careful not to overtighten the bolt or it can snap. The same seat post bolt was supplied in all the different Campagnolo group sets. However, in Campagnolo catalogue 18 (circa 1983), the various group sets were only supplied with the 8mm diameter bolt. Referencing Campagnolo catalogue 17a (circa 1975), the seat post bolt was available in either 8mm diameter (part number 1072) or 10mm diameter (part number 1070). Vintage Campagnolo Seat Post Bolt (disassembled) HistoryĬampagnolo Super Record was released in 1974 as the successor to Campagnolo’s top tier group set, Nuovo Record.
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