The 'trick' to the servo saver back in the day was to just run it as it is. Nothing wrong with the kit item. The spring is soft compared with today's servo savers, but that's how they were run back then. Once you have freed up the servo saver you will find the spring is capable of doing its job. Everyone used the standard setup with a servo horn and there were no hop ups for it, I can't recall any car at the time having ballraced steering cranks.
The trick is to make sure the plastic parts are free on the posts. Looking at the picture it looks like it's had some use, so I expect everything is binding in there. It can also have been overtightened when installed, causing the posts to swell at the bottom and caused it to bind up. You shouldn't have any grease in there, it will cause drag and prevent the saver operating properly. Remove it from the car and check if the servo saver swings freely on the post. Check for any scoring on the posts and use some T-Cut to polish the posts. Check if the plastic parts are still stiff, if so you want to clean out the plastic parts, check for any plastic at the edges, and if there isn't any use a fine sandpaper inside the posts to enlarge the hole. Keep on trying on the posts so you don't take too much off. Once the plastic parts are free on the polished posts reassemble in the car and check they are still free.
The servo is just servo taped in there. To make it more secure run a tie wrap around the servo, there's just enough room to fit it in the gap next to the belt cover.
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