On Sat, 17 Jan 2004 07:02:38 GMT, "Nedman"
may have said:I am trying to decide whether or not to invest $100.00 or so in a Park press for headset cup
installation. I've used them before, and they do work well. I don't have any one that I can borrow
one from right now, so either I buy one or fashion some sort of home-made jobber. I usually press
in no more than a couple sets in a given year, so if anyone has any contrivances that worked for
them, I'd like to hear about it. TIA, Nedman
If the large washers sold in hardware stores were made with their internal diameters at a useful
dimension, it would be trivially easy to throw one together from a piece of 5/8" (or similar size;
that's just the one that's reliably available cheap nearby) all-thread, two nuts and two washers. I
have a number of such home-made press tools for various applications, but I find that I usually end
up making my own washers by taking a piece of 1/4" plate, hole-sawing out two discs in the needed
OD, and then counterboring them on the drill press with a bit that leaves very little clearance
around the threads. With just the hardware-store washers, it's likely that the assembly won't stay
square. (It also helps to wrap duct tape around the shaft at the required positions in the
appropraite thickness to ensure that the shaft stays centered in the cups.)
Until recently, all of the frame cups I had replaced were in steel head tubes. I can't say if
aluminum tubes are touchier about the process, but I expect them to be, and I take greater care with
them. Swapping out the cups in steel head tubes has been a snap.
One caveat: If you are dealing with a virgin frame from a specialty builder or high-performance
manufacturer, there is a distressingly high probability that the head tube will be only semi-
finished; it might not be the right ID at the ends, or not square, or both. On a bike that has been
in service without problems, I consider this to be an issue worth ignoring. The degree to which
people consider this to be a must-check thing seems to depend on whether they have the tools to fix
it, which I don't.
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