Here's one of my 'beefs'. If I decide to make an improvement on my Champ or a like plane. Let's say put a better set of brakes on it as parts are either difficult or unable to be obtained any more, then I need to go through either the PMA, STC (if they even exist) or the 337 process. Meanwhile the kid down the street can jack his pickup up, install a non standard exhaust system, change the intake system, do his own brake work, install power steering etc. with no paperwork involved.......I'm sure you get the picture. Whose more dangerous to the general public me or him? Having said that I have been able to get several 337's through over the years but it sometime takes a lot of 'pen pal work'.