What the heck? Can’t move the lower spring perch

[Andy69]

Stock Bilstein dampers on a 1992 Supersport. Tried to adjust the ride height in the rear, left rear perch won’t budge. I’m thinking differential metals corrosion. Have it soaking in PB Blaster now. Is this a common thing and are there any tricks?

 

I only need to move it up one slot, so no biggie if I can’t get it, my lard butt should even it out with the right, plus I’ll be buying new ones soon.

 

 

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