I only have the same as you have above as far as the schematics go, I do have the same erea for the 5A engine,

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All very interesting Unki and I would also like to know of the different part # for the series 1,2&3 and if they even change, another interesting thing is the Romoto 1 & 2, Automatic and your 3rd scan all list the same part# for the plug spanner, #8-200 but in your second scan it shows the bent bar spanner for the toe ring as previously discussed, still a lot of grey areas will need to be cross referenced before we can put this one to bed I feel.

before we move to far away from the Fuel caps I have some images that I will put up because I have two that are green plasic but look to me to have original paint on them, firstly I thought I will show everyone what the clear/white cap looks like without paint.

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this is it when painted and looking on the inside, as all can tell matches perfectly with the image Unki put up.

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next are the only other green caps I have and they are all green plastic, one plain and two painted, the one on the left came off my outboard engine #131049, the one in the centre off Model 4 engine #125166 and the one on the right was not on a mower.

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If you dont make a mess you aint making anything.