I did the window regulator in my 135 myself with almost no problem. The only problem I had was getting the window off the old regulator. There was a reverse threaded bolt that I probably ended up tightening and had to take it to a shop to have it drilled out. It was hardened steel though, they had to essentially melt it out with a high speed carbide drill. I posted a semi-DIY/help thread somewhere on the forums
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