MDF for table saw miter bar on sled projects?

I would not want a table saw that trapped my miter gauge bar so that I couldn't remove it at any location on the table, so I favor removing the

Build custom hold-downs for T-TRACK miter slots Perfect for accurate repeat cuts for sliding table saw sleds A must-have for clamping, slotting, stopping, and

miter slot Some tablesaw jigs, such as cutoff sleds, ride in the saw's miter slots, and a well-fitting miter bar keeps these jigs accurate

miter slot runners miter slots With their highly functional design, these aluminum bars are precision machined