I wore out three dremel cutting bits but I finally got the donor stem and the raw stock fitted together. Now I just have to find my brazing wire out somewhere in the garage (or run by the welding supply store to get some more) and apply some heat with the torch to get the metal parts joined together. Getting everything matched up was a long process, because this was a “sneak up on it” operation. I only had one donor stem and one chunk of raw stock to work with, so I had to not make the hole too big or ruin the donor stem trying to get it inside the raw stock. Plus there was the whole “pride in workmanship” thing. I wanted something that looked as good or better than the bike it was going on, so as to not distract from the beauty of the bike with an ugly stem extension.
Anyway, this was where we left off last time I had a chance to work on the extension.
And this is what I have now.
And this shows how the cap from the donor stem is flush to the top of the raw stock.
Now the plan is to heat the raw stock until braze fed in at the edge of the opening flows into the tiny space between the donor stem and the raw stock to make them a solid piece capable of withstanding ferocious forces, or at least that won’t fall apart when I ride exuberantly. Seriously this thing is fitted so tight that I doubt it will take more than a couple of grams of braze to completely fill the gaps. The rest will be used to make a smooth fillet between the raw stock and the donor stem, that will have to be filed smooth after it gets applied.
Something I have been thinking about is cutting a filler piece to cover the gap at the top of the donor stem, so the donor stem looks like it grew through the raw stock, or out of it. I also want to grind down the weld where the clamp joined the donor stem, because that MIG weld looks like a worm crawling around the clamp. You can see the weld (but not clearly) in the “before” picture at the top of the post. That’s the “pride in workmanship” thing again. If I’m going to put all this work into making it I will go ahead and do the little bit more work required to make it “not ugly”. I don’t see the point in just making something ugly.
I watched the Sprint Cup race from Richmond last night, at least the parts I could stay awake for. Yes, I fell asleep (several times) watching that race, it was that exciting. I’m glad Matt Kenseth had such a good race, but dang, what has happened to short track racing in the Sprint Cup? Now we go to the first race on the Chase for the Cup in Chicago.
Now I have to get ready for evening service at church, so I’ll see y’all tomorrow.
PSA, Opus the Poet
Witch on a Bicycle 