Now do you mean shock or fork?
For a shock you are better off using the proper tool. If your Ohlins has a remote preload adjuster, you will need a proper spring tool. Most cheap (threaded rod with hooks) are meant for car springs and would be tough to use on a bike shock. I have changed shock springs using a cheap hydraulic press (might need special adapters). I have seen shock springs come loose and fly accross the room.
You are going to be at Blackhawk on the 19th and/or the 20th? I have access to a spring tool at a shop (as long as the shop is open) if you have time before or after Blackhawk (I am about an hour from the track - WI).