I didn't pay much attention on my Bitubos but every shock absorber I've ever had was easy to take the spring off of with an appropriate small spring compressor. I usually use a modified automotive spring compressor that was made for much bigger springs. I just radically cut down the size of the arms that hook the spring. It sometimes still scratches the shock body if I'm not careful; I really should re-shape the parts that hook onto the spring.
I sometimes used two small high-quality ratcheting tie-downs laced around the spring coils. I've also seen all kinds of useful homemade lever compressors. I've seen bolts welded to bead-breakers, so that the bead-breaker compresses the shock with the spring on it; then with the spring already compressed it's easier to clip on a spring compressor.
I sometimes used two small high-quality ratcheting tie-downs laced around the spring coils. I've also seen all kinds of useful homemade lever compressors. I've seen bolts welded to bead-breakers, so that the bead-breaker compresses the shock with the spring on it; then with the spring already compressed it's easier to clip on a spring compressor.