My local club went to visit "The Spyder Factory" in New Hampshire, yesterday and I'll be forwarding a link to the 100 or so pictures I'm trying to get posted, but since I know some of you were bemoaning the fact that true, VERY authentic Porsche slotted rims are becoming Unobtanium these days, I thought I would show you what some builders can do, if you want perfectly authentic rims for your original, $4 Million 550 Spyder which is going through a restoration and your current rims have some rust on them:
First, have a tool maker make up a set of forming dies for $$$$$
Next, get a REALLY BIG Hydraulic press good for 100,000 lbs. or so and press out some centers, like this:
Then, with another die set, press out the slots, while indexing the part a precise number of degrees of rotation for each hole, then trim the center and rivet it to the outer rim to get this:
And that's just for the wheels - this shop is reproducing, to original Porsche factory drawings, complete 550 Spyders in aluminum Alloy formed on bucks, just like the originals, complete with 4-cam Carerra racing engines.