What’s the purpose of the spring loaded idler sprocket?

[Kyle2643]

This sprocket pinged off during a wet belt replacement as I was hand cranking and now it’s loose. I understand I need to remove the idler pulley and reset the spring and then replaced the bolt but what is it even for? Why is this not just one solid sprocket?

[metalworker0]

Think it's some sort of anti backlash gear .. i don't understand it, as ive never pulled one apart.. if i had i would know.

These guys have ; LINK BELOW... it can be difficult to understand how it knits together, and Can be assembled wrongly, from my point of view, sitting here in a chair, sorry, i have no idea.

viewtopic.php?f=65&t=227506&start=15

Perhaps they will come along and explain .

all the best.mark

[Kyle2643]

Thanks Mark! I was able to work out what it's for and what needs to be done from the link you provided so thats a massive help mate thank you again.