How do you do your initial alignment after installing the jig?
I have used jigs that butted up against the door for repeatability, but in this case I just visually aligned the items. The overall height is 0.35" above where the crumb tray would have been. So I entered 0.35" as the material height.
Also have been known to run a position test on a replica piece of scrap MDF positioned in the slots before doing many multiples. Once it’s dialed in it doesn’t move.
I’ve wondered about the repeatability of absolute positioning… A taped grid on the GF floor, for example, would let you place the jig precisely each time.
Used a sharpie to mark positions.
I use a pencil…easier to erase. 
could also use gaffer’s tape, since that’s literally one of the jobs it was designed for. 
And if the world were truly a stage then I’d be fine with that precision. The wife has a Theater degree. Hitting marks and set design were her life. I learned to hate gaffer’s tape.
hah, as a musician, gaffer’s tape is lifeblood for setting up on stage. so many cables to trip over if they’re not taped down… i use it for lots of GF stuff, like testing to see if parts cut through (although still gorilla for cleaning out detailed masking).
I play acoustic on stage. Folks in the back weren’t listening anyway.
we always went by the philosophy of “how would the ramones cover this song?”
Oh, it just ended up being a piece of MDF glued/screwed onto two pieces of moulding. Not worth a picture. It’s working and running the job! No fallouts!
LOL. I was thinking the same. I laughed the other day when I found a random thing of gaff sitting in my house in a place that served no musical purpose. I chucked and thought “After these decades of using it, apparently I can’t have enough.”
LOL!
Thanks for the help everyone.
@SmokeWalker I’m happy to hear you figured out the issue.
I’m going to close this thread - if you run into any other trouble, go ahead and post a new topic.