2006 S60 2.5T AWD: how much force is needed to secure a compressed coil spring (for safety purposes)?

[FMradio]

Hi
In the future, I will be assembling new front strut assemblies for my car from the individual parts (reusing my old springs), so I'll need to use a spring compressor to compress the coil springs for assembly. I've familiarized myself with some safety info about using a spring compressor.

I've heard horror stories of spring compressors failing and letting a compressed spring jump out and cause injuries. I would like to add ratchet straps onto the springs while I am compressing them as a failsafe to prevent the spring from rocketing out if the spring compressor somehow let go. (Heard this idea online)

Would a ratchet strap with 10,000 lbs breaking force, or 2 ratchet straps with 5,000 lbs breaking force be able to keep a compressed Volvo S60 coil spring from springing out and hurting me? I grabbed the 10,000 lbs figure off of a Jeep forum https://www.cherokeeforum.com/f67/compr ... ap-105362/ though it's a completely different vehicle so it may be totally irrelevant.

Thank you, Andy

[abscate]

The good spring compressors have safety retainers that prevent the spring from getting away, like this one

https://www.amazon.com/ABN-11-5-Strut-S ... NrPXRydWU=

For about $50 you can get the next model up with a positive spring clamp.

Using straps is better than nothing, but a shock rating isn’t likely to be as high a static load fading, figure a factor of 3x less.

You can estimate the compression load by measuring spring compression on car, loaded and unloaded, then using Hookes law to determine the rough spring constant

[vtl]

$80-100 on ebay. One of the best garage tool investments.

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[cn90]

I use 2 sets of compressors. You can fit 3, even 4 compressors on the regular springs.
I posted some photos in forum (S60 and XC90).

[BlackBart]

I have these. They grab the coil with a locking pin so it can't slip out or off.

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