Hi NiteMare, thanks for the detailed process instruction.
Ours is 109, originally hard top, but I have put a truck cab on it for better useability. My Father in law bought in brand new in 1976 and it is has not spent much time off the farm since then. Fundamentaly no maintenance for the first 20 years of it's life, and only rudementary stuff from me since then. Still runs well and is warranted and road registered. I very much doubt it has heavy duty springs unless they were standard.
When I have been crawling around under it in the last few weeks (exhaust repairs and full fluid replacment) I have looked at the springs and wondered what was inside those rusty looking stacks. Diesel and waste oil I have, so will give your method a try. No desire to pull them apart as it seems like a lot of work for possibly not a lot of gain. The bushing repalcement in particular sounds horrific from what I have read. It is not as though it is a daily driver!

