400 plastic on a 300

I am wanting to put 400ex full plastic on my 300ex. Ive seen a couple do it but in dont know how.any one who has done it please tell me how.

[Sparkles]

why do u want to do this ?

[Ben]

Here is everything you need to know:

http://209.120.142.52/showthread.php?s=&threadid=3963

I was going to do it but it turned out that it really wasn't going to be any cheaper than 300 plastic so I order the shiny new Maier plastic for my 300.