Anyone have directions on how the locking bolt comes out? Removed the screw from the straddle block but the locking bolt still wont move from the straddle block.

Take out the pins for the tumbler and sears

How does that effect the locking bolt or straddle?

Take them out and see

This may be of help.

https://www.shotgunworld.com/threads/ithaca-flues-takedown-reassembly.434969/#post-3533349