Some interesting video on tape machine alignment and tape splicing from Brad Leigh
You can also complete his full tape alignment course at www.analog-tape.com
https://www.youtube.com/watch?v=LNCQLQhFlX4
https://www.youtube.com/watch?v=qHeKes8maKU
https://www.youtube.com/watch?v=_TARpAdIjRM
https://www.youtube.com/watch?v=UQOfFwsT_bM
Alan