Restoration of Old Slot Machine

I saw this pop up on my YouTube page and found it to be quite interesting. Fair warning, this takes almost two hours to watch the whole thing, but found it fascinating with all the little parts involved. No way could I keep it all straight.

Part 1: https://www.youtube.com/watch?v=bakPV_vVraQ&t=2341s
Part 2: https://www.youtube.com/watch?v=FJ8m7HPLH64
Part 3: https://www.youtube.com/watch?v=K0l4pv7_YrQ&t=31s

I looked at the paytable and the reel strips and decided to take a shot at determining the expected return. If my calcs are right, I see an expected return of -24%.

I found it odd that the Lemon symbol appears on the first and third reels only, so it's basically a blocker on the first reel.

Reel strips and EV calc is as follows - happy to have someone check my math. I've assumed unweighted reels and one coin to play.

Reel 1	Reel 2	Reel 3
Cherry	Bar	Orange
Bar	Orange	Lemon
Plum	Cherry	Plum
Cherry	Bell	Bell
Plum	Cherry	Orange
Orange	Orange	Lemon
Cherry	Cherry	Plum
Bell	Plum	Orange
Plum	Cherry	Bell
Cherry	Orange	Plum
Lemon	Bell	Lemon
Orange	Orange	Orange
Cherry	Plum	Plum
Lemon	Orange	Orange
Plum	Cherry	Bar
Cherry	Bar	Lemon
Lemon	Bell	Plum
Orange	Cherry	Orange
Cherry	Orange	Bell
Plum	Cherry	Lemon

Paytable				Prob	Prob	Prob	Total
			Win	Reel 1	Reel 2	Reel 3	Prob	Profit
Bar	Bar	Bar	20	0.05	0.1	0.05	0.000250	19
Bell	Bell	Bell	18	0.05	0.15	0.15	0.001125	17
Bell	Bell	Bar	18	0.05	0.15	0.05	0.000375	17
Plum	Plum	Plum	14	0.25	0.1	0.25	0.006250	13
Plum	Plum	Bar	14	0.25	0.1	0.05	0.001250	13
Orange	Orange	Orange	10	0.15	0.3	0.3	0.013500	9
Orange	Orange	Bar	10	0.15	0.3	0.05	0.002250	9
Cherry	Cherry	Lemon	5	0.35	0.35	0.25	0.030625	4
Cherry	Cherry	Bell	5	0.35	0.35	0.15	0.018375	4
Cherry	Cherry		3	0.35	0.35	0.6	0.073500	2
Losing Spin							0.852500	-1
								-0.24

Of all the reading I'd done in EM slots, I never knew that some have symbols that don't appear on the paytable. I would think these are less collectible because of their lessened fun factor.