Not satisfied with the commercially available versions, Jonathan recently built an ATV spring compressor.
In this video, he demonstrates using it to remove & re-install the spring on an ATV coil-over shock absorber.
Mistake in video - the coil-over shock is not quite a McPherson strut.
If you are inspired to build your own spring compressor, feel welcome to use any ideas from this video.
Thanks for watching! Resurgence Small Engine Inc.