Hi all. Hope everyone is well. Simple job proved difficult. Trying to replace front lower wishbones. Stuck for the moment in seized front bolt that is the torx one that goes through the chassis leg. Haven't tried heat yet but have tried and destroyed a couple of chrome van sockets with torx bits on the end of a 2x foot breaker bar. Ordered a 3x foot breaker bar plus impact torx bit with 1/2" fitting. Also made a dish shape with plastercine above and puddled wd40 in it to let it seep around the bolt. Anybody got any advice ? Perhaps I need to eat more red meat !

I was going to say an impact wrench good luck it sounds like you’ve done everything else.

Try using a penetrating oil such as PlusGas rather than a water dispersant with some penetrating properties. The clue is in the name WD40.
ACF50 has a capillary action that will creep into a thread and help.

Heat it up with a blow torch then spray penetrating oil as it cools the oil will get sucked in.

Good luck. 2013 FL2 XS.
Defender 90 300 TDi.
Defender 90 300 TDi CSW.
1964 MGB Roadster.
1944 Willys MB "Jeep" with bullet holes. (gone)
17 hand Irish Drought Thoroughbred (mostly lame)
Nagging Old Boiler.

Then:

Heat up the area & freeze the bolt with electronic freeze spray. The thermal expansion & contraction might help "crack" the thread. Procrastination, mankind's greatest labour saving device!

Acoustic insulation ARB TPMS 3xARB air compressors After cooler Air tank On-board OCD pressure air/water cleaning Additional 50L fuel Carpet in doors ABE 2x1kg Waeco 28L modified fridge Battery 4x26ah Solar 120w Victron MPPT 100/20 DC-DC 18amps 175amp jumper plug Awning 6x255/60R18

Get Stahlwille tools. Procrastination, mankind's greatest labour saving device!

Acoustic insulation ARB TPMS 3xARB air compressors After cooler Air tank On-board OCD pressure air/water cleaning Additional 50L fuel Carpet in doors ABE 2x1kg Waeco 28L modified fridge Battery 4x26ah Solar 120w Victron MPPT 100/20 DC-DC 18amps 175amp jumper plug Awning 6x255/60R18

I had trouble with these two bolts. The first one needed a four foot scaffold tube on the two foot breaker bar. With the second one I rounded the torx hole and had to have a garage weld a larger nut to the bolt.

I suggest anyone doing this work on the wishbone slackens the bolts first before anything else, that way you can drive to a garage if needs be.

DeWalt DCF899 will do the trick. 950NM, it spun mine out in seconds. Astonishing ability to rattle out a stuck bolt without damaging the bolt head, I've used mine on some bolts that looked like they had been in the sea since D-Day and it just pulls them out. Current driveway contents:
2021 V60 Cross Country B5
2009 FL2 dog bus and shooting wagon

On Order: 2023 Fisker Ocean Ultra - deposit paid.

Thanks for all the advice. I'll see how I get on with heat etc. Failing that I can see me purchasing DeWalt DCF899.