I don't worry about getting the grounds spread too evenly. I just walk around the lawn backward, shaking the bags back and forth as I walk. Some spots get a little more and some spots get a little less. It doesn't make as much difference with something like coffee grounds (not like chemical fertilizers where you can see exactly where they were spread heavier or lighter).

It might be best not to excede 1/8" layer of grounds. If the application method leaves hi & low spots then apply just before rain. as for myself, being low tech, I apply by using my hands - this way I can crush the "hockey pucks". Sometimes I mix with 50% compost, that saves a step. I have also used an hand held sifter, but it is no faster. I gave up on using a spreader. I guess a 10'x10' takes about 1 min, and you get to see every weed in the yard!
In the spring I had bare spots, but by selectively using compost & grounds on those areas they have disapeared.

Thanks for the feedback, guys! I'll use my hands too, and not fuss so much about blending it in evenly.

Here's my "low tech" method. Rip open the side of the bag, set it down in the yard, reach hands into bag and fling. Repeat the last three steps until all grounds have been distributed. That's about it.

hi estreya,

I mixed coffee ground that I got from starbucks with CGM and CM. I just use my hand to mix them thoroughly. Some coffee ground are so sticky together. But once it's get mixed with CGM/CM, it will be easy to spread using broadcast spreader. However, sometimes, it gets stuck. I just use my hand again to reach the hole and clear it up. :)

I have 6 bags now of coffee ground and I will mix it with SBM.