Lucas DES injector pump throttle return spring

I had a stuck fuel cut off in a Lucas DES injector pump. I foolishly took the arm and throttle return clock spring off the outside of instead of just disconnecting the throttle linkage. I searched and found a post "Lucas CAV Throttle Linkage Question" where thepumpguys said there was a trick to getting the spring back on (and under the correct tension). I saw on a different search and a different pump, but similar clock spring where a wire was used to tension the spring and get the end up on the throttle arm. Any chance someone could share a procedure to help me out?