good day man, how do,
i'm not sure what pics you are talkin bout i left out..... i'll look back and see if i can't fill the gaps for ya...(just looked, i'm not sure what happened to the pics, they were there a while back!)
as for the kind of sprayers..... not sure the brand name, but they are known as spinner sprayers... bot them from my local hydro store...
as for them getting plugged up, every once in a while 1 will get plugged and not spin, but it all depends on the fertilizers u use for your mix.