I've found a used LB 21 Self propelled w' aluminum deck. My concern is that it's 4 hp, and I'm afraid it won't have enough power. I did a search and read a good thread on 21's -.. MOW ED posted that he has one - If mow ed or anyone has any opinions on the 4 hp units let me know. I'm gonna try to go look at it late this evening or tomorrow. Thanks for the help.