Widening table saw miter slots

[azk404]

Hello

Ive noticed on my cast iron table saw the front and back ends of the mitre slots are maybe 0.3mm narrower then the middle which makes sleds stick when being pushed to the end, and its very frustrating.

Has anyone widened these slots a bit before any advice on how to do that?

Cheers
A

 

[ChaiLatte]

0.3mm narrower covers a lot of possibilities.

Relate the slot position and width to the blade and fence position before you touch them.

Is the 0.3mm reduction all in the right side of the slot? All in the left side of the slot? 0.15mm taper (parallel taper) equally in each side?

Draw a map at an exaggerated scale of the slots, the blade and the fence. That map will rule in and rule out various remedial measures open to you.