that sounds even more riskier ... wouldnt it be safer if i just undo the tophat it from the top before even removing the sussy ..?
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Look mate, I've done this excercise both ways >i.e. undoing the centre bolt (shocky shaft) with the weight of the car on the wheels as you're talking about. And by using a compressor after you've taken them out assembled. Believe me, it's a whole lot easier (never mind the safer) with them out of the car intact, than having an expanded spring, a shocky shaft that is also expanded (because of the gas in the shock), and trying to undo all the other sussy bits you'll have to get out of the way in order to get the assembly out, especially the back ones.
You may be able to hire them, but the hire rate will probably cost almost as much as buying a set of compressors. If you do get some (and I'm assuming this is for the EH Civic), get the ones with the single hooks at each end, the coils on them are too small a diameter for the twin hook type to fit.
There is another factor in this, you need to note (mark) the position of the top hat (upper spring mount) in relation to the shocky if you're re-using the stock ones, because they are left and right at the front and the top hat is at an offset angle in relation to the yoke at the bottom. You also must, when installing the new springs, make sure that the bottom coil is sitting correctly against it's stop in the seat. If they aren't you'll finish up with springs that are curved inwards against the shock body which will put a bending stress on it's shaft.
You can buy a set of spring compressors from repco for 85 bucks or so.
These will do the job for you. The hooks are not too long ( some other brands stick out too far and will dig into the side of the shocks) and a good price.
http://www.ebay.com.au/itm/Coil-Spri...item45ff8fd74f
Supercheap sell them for $30-40 odd dollars...
I've tried all different methods without spring compressors, all of which are not safe. Spend a few dollars for you own safety, please!
Having said that though, the best method I used without them was to lay the strut flat on the ground, hold the strut/spring with one foot (make sure you have it facing away from you or any valuable objects). Then hit the centre nut with a rattle gun. Once the nut is out the strut would shoot across the floor. Rather than the top hat flying into your face.
To get it back on I either got a mate to hold the top hat. A few times I did it with my own weight, not easy though.
Jack up ur car --> find a flat surface under the car --> place spring between the surface and flat ground --> slowly lower the car un till springs are compressed --> using a metal cloth hanger tie around the spring --> slowly jack up the car
Done, vise versa
lol @ this thread