…because I could easily live in the 19th century. This is how I see it:
And this is what I have missed:
Maybe it is the reading of late Victorian literature that has spoilt me in this respect. In terms of rules, the others are right, because generally, we double single consonant letters at the end of any base where the preceding vowel is spelled with a single letter and stressed. Here‘s a couple of examples, including the weird ‘parallelled’.