Teletype lubrication advice

I'm going to be using my 33ASR at what now seems to be an annual classic hardware exhibition for Computer Science at York, so a spot of preventive maintenance seems to be in order. I have Vol.1 and Vol.2 of "Bulletin 310B", Technical Manual. Vol.1 is installation, disassembly/reassembly, lubrication, theory of operation; Vol.2 is adjustment information (Is there a parts manual anywhere? I'd like a copy of that...) It says to lubricate the motor bearings at each end. But mine doesn't look like it was designed for that. It's a standard (for the UK) Teletype motor part no. 182267 (115V 50Hz). Are these meant to be "sealed for life" or is there some way to oil them that I've not spotted? I'd like to get a new typehead. Mine has suffered from apparently being used after the rubber hammer cap went gooey and fell off. It now has a thin self-adhesive rubber foot of about the correct thickness installed, but some of the characters were already damaged. -- Pete Peter Turnbull Network Manager University of York