Michael Your tensioner is bad. The tensioner should hold pressure so you do not have slack when you start the car. The fact that there is slack could be what has caused your problem to start with. The clattering sound on startup is the first sign you need a new tensioner. By the way those prices are high a new febi tensioner is @us$60 and a chain is US$80
Good luck this weekend.
m

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)