I imagine it's there to protect the shaft from pitting, as that shock probably take the most abuse from foreign objects. I guess it's a personal choice if you care about how long you want the shock to last.
How did it come off in the first place tho? If you have the skid out it's not that hard to get on.
They are mainly to protect the shock shaft from debris and pitting, If you forgot to put it back on and are lazy like I was, you could cut it down one side and wire tye it back on. it has worked on my sled for two seasons now.
i took the shock off and when i put it back on i couldn't get the cover back on because i couldn't get the shock back on with it on....don't know y but o well....but either way the skid ended up back in the sled (my dad wanted more room in the garage so he put the sled back together on me) and the cover wasn't on so i didn't know if it was worth it to pull the skid back out to put it back on or not
it don't fit because well.... i have the preload on my spring all the way up and i couldn't compress it enough to get the spring in the skid with that on the spring. i know that you shouldn't have it all the way up but it gives me the ride i want so i figured it would be alright, i know i need to get a new spring for it but at the moment im a little short on cash from having to pay to fix my car to gas for the sled and the trips im gonna go on, after all that i end up with no money for a new spring so i figured id make the best of what i have. i also need to get the shocks redone because there 10 years old and i don't think they have ever been rebuilt (bought the sled used in 2002) but theres only 2000 miles on them so there not HORRIBLE yet but there pretty bad. sorry about the ranting but thought i would tell you all that lol