Originally Posted by fleasbaby
To build a pair of SennGrados ou need the following:
1 X pair of full-woody Grado-style cups (designed for a fully liberated driver)
1 X pair Sennheiser PX100 ii
1 X suitable headband (look for anything that looks like the Urban Ears Plattan's headband, you can also use the Sony MDR 7520 one, or a Grado headband)
1 X cable of your choice
You will also need a soldering iron, the ability to use it for rudimentary soldering/desoldering and a little time on your hands.
Liberate the Sennheiser drivers, mount them in the wooden cups, solder them to the cable and pop the cups into the headband...I know I am paraphrasing horribly here, but that's the gist of it. Its not nuclear physics
While this list certainly is helpful, I believe Mangler's question was regarding the actual mounting of the drivers in the cups.
Since not all Grado cups are created equal, you may need to add electrical tape, glue, weatherstriping,etc. to the circumference of the PX100-ii drivers in order to get it to fit snuggly inside the cups.
I'm actually currently working on putting together my own pair of SennGrado's to see how they perform. Using the Turbulent Labs Vintage cups I've found that:
The PX100-ii driver circumference is a little bit smaller than the opening of the cups. I suspect you will need to add some weatherstriping to the driver for it to fit inside the cups.
In addition, the PX100-ii driver is quite a bit thinner than the Grado driver, so there is an option to slightly recess the driver if you want.
Anyways, just my findings having just started to source the parts to put this together. Feel free to comment since I know some people have found that the PX100-ii driver lip is "just" large enough to slip inside their cups.
PS: With regards to the headband, I know a lot of people have suggested the Urbanears/Auvio headband. My problem is that there is limited to no horizontal adjustment, so it is really hard to get the cups to sit flush to your ear.