In Reply to: 8n seat spring mounting studs posted by Doug on August 06, 2019 at 17:38:39:
Option #1: Use an Easy-Out with a few days spent spraying some PB BLASTER into the holes first. Spray a few times a day for 3 days before trying. Option #2: Remove the top cover and access it thru the bottoms of holes. Spray some PB first too so if there is enough stud length to grab it will be easier to remove. Just trying to drill it out with a hand drill isn't going to work -it will walk and ruin the sidewalls or just break. A hand drill probably doesn't have enough HP to drive the stud out. A good machine shop will have a magnetic drill press to lock the unit in and you can use a carbide drill to better break the hard stud material. Removing the top cover is the right way but the most time consuming and labor intensive. If you need a hydraulic repair might want to tackle that at the same time.