Brian, honestly with all that's been going on, forgot that I got that mulching kit last year, and since I put it (mulching kit) on, haven't had to use the lawn rake yet.
Yard looks bare, no leaves on the lawn from using the kit.
Kit consists of three "mulching" blades and a restrictor plate that you place over the discharge chute. Look at your mower closely, you should see where the bolts should go.
If you have huge amount of leaves, you need to go slow, half throttle, and you may have to make a second pass (this is where the leaves are gathering by your feet on the mower because they're so deep).
Keep up with it, just like mowing the grass.