Or just bring it to a machine shop, and they'll make quick work of it. I had Forrest (blades) rebore a bunch of my old blades for my new table saw (which has 3 holes). I think it was $10/blade.

Timberwolf Tools still sells 13" blades for the old and revered 13" Makitas. I believe it has a 1 inch arbor (maybe 25 mm), but as noted earlier, it can be bushed.

There are also companies that will custom manufacture blades, though there is usually a minimum order.

Bob do you know the part number for that 131/8" blade?

We bought two of the new 10 1/4" Makitas when they debuted about three years ago. Good saws. The bases are greatly improved. Easy to square, and they will stand balanced on their "nose" so you can set them down and pick them up with ease.

But I still love my Bigfoot the most. It is good to have a righty and a lefty for compound and other situations.

I tried the Diablo 10 1/4" blades--crap. They are so thin they wobble and it is impossible to saw a flat shoulder in oak. Even when you hit the line dead on, your straightedge will reveal a hump in the shoulder. The blades I bought from Bigfoot were starting to do the same. But no problems at all with the new Makita. So I modified the Bigfoot arbor to accept the new Makita 10 1/4 blades. Now I get dead flat shoulder cuts all the time.