75 to rent this spring compressor is such a rip-off in my opinion! A little mechanical ingenuity and appreciation for the powers of the spring and how to control it's loaded pressure will save you BIG bucks, improve your mechanical skill, confidence, and not fatten up someone elses billfold.
There are so many things that can be done without the special tools, like rear whell bearings on a 123 for example. Sure, the right tool is nice to have and sometimes is faster, but not what they want for something like the spring compressor - what a rip both to buy or rent!!
Have fun, and BIGRED, Great job - you would do it over again the same way, right?
Adam