Not to leap to Jims defence, he's a big boy and can handle himself! But he's got a point - your vac motors are an integral part of your setup - it doesn't make sense to faff around to save a few quid when if you lose half a days work when it goes pete tong you'd be worse off anyway.
Plus, I have to add that I don't think jim comes across as a smart arse, he's helped me and plenty others in the past with his experience - and bearing in mind that aint his job, I'm always grateful for whatever help I can get.
My 2c worth anyway.