Good point, Duchess. So he can do those simple jobs - he may not be an expert, but actually in the views of most arty types, being able to mend a puncture on a bike is quite an achievement.
I think Bennett comes over rather well in Love, Nina - I think he probably just looks at it and sees a very partial portrait of himself, as we all do, I suppose, when we're described by others.
There were a couple of bits in Love, Nina, where I wondered if she'd invented bits later. For example, she refers to Bennett using the phrase "the elephant in the room", which didn't come into popular usage until much later.