Rack and Pinion Rebuild Tool

[IndestructibleYaris]

I'm getting into rebuilding rack and pinions for cars, yet the yaris is the only design that's never supposed to be serviced. What gives? What do you do when it inevitably wears out? The tool to remove the preload cap is some weird torx shaped bit the size of a golfball. Have mercy. I tried a piece of 1/8" thick flat stock and it just pretzels. The cap must be loctited on there, but it's not something that's meant to be torched. Any help is appreciated. Thanks

By the way, this is the first fastener in my automotive and big rig career to not come loose