Flaring tools are worth having there's around 30 pipe flares required on a 101 anyways (brake and clutch from master to cylinders) so it's worthwhile, and its a handy facility to have on hand.
The Detroit is and easy fit, I managed it within Garry's timescale, which included and hour or so removing a halfshaft after a bolt sheared, an interesting situation eventually resolved with a 4 foot crow bar an a 5 ton bottle jack.
The resulting bang when it finally let go was pretty impressive, as was the distance the halfshaft travelled, out of the axle and about a foot across the floor.

