Grumpy, the 18" MTD mowers had a star drive centre on the bar blade and are no longer made, instead they sell a blade carrier with swinging blades on the end. Its made out of 3 or 4mm steel plate.
Something like this one thats in the store
![[Linked Image]](https://www.outdoorking-forum.com.au/bmz_cache/6/65583c6dcd286bb4f3e9d61c2baf8cf1.image.300x83.jpg)
Id say this conversion is the same thing but for the ride on. When i was looking into a blade for the push mower i did look at some ride on blades, but decided not to chance buying a pair of blades that wouldnt fit.
