727 doesn't shift into second gear like it should

I was reading over the instructions tonight for a refresher before I go back into it. The instructions say to take out the accumulator spring and thats it. No mention to block it with a rod or anything. Guess that is why I just took the spring out 20 years ago. I will make up a rod to put back in it. Scamptramp mentioned the rod length, but what about the diameter, maybe something around 3/8"?

I've noticed some kits don't mention installing a blocker rod. Admittedly I haven't read a lot about them breaking and I've only ran into 2 that were broke but both had the springs removed. I just figure since it has 100 lbs. of hydraulic pressure slamming it back and forth it's a possible failure point. Yeah 3/8" dia. will work.