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There are at least two different types of knives used on the older Mott mowers. It sounds like you have the straight knives that are about six inches long. On my Mott F6, I have a different setup that I believe are called "rock and trash" knives. These do a better job handling rough stuff, but they are a far cry from the heavy duty knives used on the newer mowers. It's hard to say if you could use the later style blades, but you can certainly go to the "rock" knives like I have. To switch to the rock and trash knives, you need for each set of knives: 2 ea blades P/N 101993
1 ea D-ring P/N 101991
2 ea Clip P/N 101992 (possibly 102650 or 105746)
1 ea bolt P/N 000032
1 ea self-locking nut P/N 000210 Montage Enterprises carries these parts (or at least used to), but doesn't show them on their web site. Flailmaster shows them on their site. Your best bet is to try to figure out the model number and go to an Alamo dealer or call Montage or Flailmaster to see exactly what setup you can use. Maybe the "coarse-cut" blades will work on your machine, these are much heavier than the "fine-cut" blades I described above. My mower is covered in snow right now, but I believe it has knives mounted every inch. So 72 sets of knives, which would be 144 total, except that the last two rings on each end only have one blade each, so 140 total. If you're going to be doing a lot of heavy brush, I would look at some of the newer machines, which are much heavier. Stuff will wind around the cutter shaft, but generally it will clear itself out. It's not difficult to stop and unwind any weeds, string, saplings, etc. off the shaft. The worst thing I've ever picked up was a garden hose, watch out for those, they are nearly impossible to remove!
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