Join Date: Aug 2006
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The fork compressor is about $120, so not too expensive. Any bike shop that has a Parts Unlimited account can order one for you, including STG.
The cartridge holder's teeth need to withstand 24 nm. That's not a whole lot, but I'm not sure PVC is strong enough. What you could do is get a castle nut socket that's the right size and get a long extension to drop it down. I can try to get you some measurements today.
The damper rod you could probably make yourself. It doesn't need to be super strong, but there does need to be a small hole where the threaded part meets the long rod, so you can see when oil starts coming out the top when all the air is out.