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Old 02-18-11, 08:15 PM   #1
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When a crack isn't a crack - the days of pressed lugs

It pays to know your lugs. These pressed Bocama Competition 83's often came from Bocama with a visible joint line up front. Depending on the skill or time available to the builder, little imperfections such as these sometimes visibly made their way onto a frame:





It's helpful to know these small oddities. Can save anyone a lot of potential panic.



-Kurt
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Old 02-18-11, 08:36 PM   #2
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Thats pretty cool. I checked my 78 professional and the builder took the time remove the line.
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Old 02-18-11, 08:44 PM   #3
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Thats pretty cool. I checked my 78 professional and the builder took the time remove the line.
The upper lug on this '78 was done right, surprisingly enough. Probably finished from Bocama well enough that it didn't show in the first place.

Though the finish on this Pro is a little sub-standard in comparison to my PY-10, it certainly is the best I've seen out of a common, production Raleigh.

-Kurt
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Old 02-18-11, 08:51 PM   #4
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Yes, my Professional is built noticeably better than my Gran Sport as well. Not saying it's perfect, but it's very noticeable.
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Old 02-18-11, 08:59 PM   #5
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Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
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Old 02-18-11, 09:01 PM   #6
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Kurt, do you have an extra top lug by any chance? I have the competition 83 bottom and the seat cluster lug but a non-matching top. I've spent hours cutting and filing and it is close but I would love to find the proper lug. If not, are you interested in parting with the set? Or if you don't want to get rid of any of them, any guesses where I could find one?
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Old 02-18-11, 09:50 PM   #7
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Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
They're not fashioned by bending them around the gap; they're simply slid on to each tube, and the brass slides into the gap via capillary action. The tubes are mitered so that they touch each other while inside the lug.

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Kurt, do you have an extra top lug by any chance? I have the competition 83 bottom and the seat cluster lug but a non-matching top. I've spent hours cutting and filing and it is close but I would love to find the proper lug. If not, are you interested in parting with the set? Or if you don't want to get rid of any of them, any guesses where I could find one?
I know you've been looking for one. I wish you needed a spare seatlug - that I have; otherwise, I'd have to break up my one complete 93 set.

eBay might be your best bet. Keep searching Bocama.

-Kurt
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Old 02-18-11, 10:29 PM   #8
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I've been keeping my eye out for one for a while. The one I've been filing to match is actually pretty good but not perfect. My triangles ended up a little larger/closer to the border than I wanted.

Here is an early shot. It's been significantly refined since.


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Old 02-19-11, 04:03 AM   #9
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I'll have to take a look at the Competition to see if there is a visible line on any of the lugs.
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Old 02-19-11, 07:45 AM   #10
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I'll have to take a look at the Competition to see if there is a visible line on any of the lugs.
Probably not - the later Comp GS lugs were not as prone to gaps. They might have been investment cast.

The Sports, Superbe, Sprite, et. al, however, were severely prone to it, for Raleigh - during the TI era - hardly filed the weld mark at the bottom of the lug. This isn't present on the 1950's examples, which use different lugs - I'm almost certain they used Hayden blanks during this period.

-Kurt
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Old 02-19-11, 10:10 AM   #11
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Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
Lugs like that are stamped out of sheet metal, then folded and welded at the seams. Sometimes the weld bead doesn't completely fill the seam and you get the lines as above.

Bottom line: it's a cosmetic issue, not a structural issue.
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Old 02-19-11, 10:36 AM   #12
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Depending on the skill or time available to the builder, little imperfections such as these sometimes visibly made their way onto a frame:
Sometimes? I see sloppy craftsmanship frequently on old road bicycles.
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Old 02-19-11, 10:53 AM   #13
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Sometimes? I see sloppy craftsmanship frequently on old road bicycles.
I was thinking about bikes in the Raleigh Pro's caliber when I stated that.

-Kurt
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