I couldn’t find much when I searched as far as what to do if you find your front bolts are seized solid even after days of spraying/soaking with penetrating oil.

I’m posting in the hope a few pictures are helpful because I didn’t turn up any.

I also tried carefully heating the bolts (being careful not to damage the composite/fibreglass spring itself) but they still wouldn’t turn.

I’m trying again, then like others, I thought I had success but it was the steel part, the insert turning in the spring with the bolt still seized into it.

My advice would be to try what I did first but if it doesn’t work you will find more pressure will turn the bolt and it’s insert. To my surprise the insert is just circular so it will spin- then knock out.

you can then use a vice and more heat etc to free the rusted bolt from the insert. Despite my corrosion it wasn’t too difficult once detached from the spring. The threads also cleaned up well with cleaning and careful wire brushing, threading in and out well once again.

I cleaned the parts (used Dremel to clean hole in spring) and painted the top of the insert but most importantly set it back in (all nice and clean) with two part epoxy.

The factory rubber pads fell off the bolts on applying heat so I re did them by using a hole cutter on a hockey puck and cutting it

Back to all good now. Hope others may find the pictures helpful at some point.

Tap out from hex bolt side. Spark plug socket was a good size on the insert. That’s the insert sticking out the bottom.

Trying again with heat in vice

Uniform undamaged hole but needs cleaned up

I cleaned up the hole with Dremel.

Set back in with two part Epoxy


New rubber from hockey puck!

 

Nice job! I remember that struggle. Mine finally came out. Both were bent!
Got lucky and found some nice used ones.
Later I put Z06 springs in.

 

Thanks. This is a new used one as there is a little bit damage on my existing spring and I’m sure I’ll want to lower the car so definitely wanted them working.