Gordon, the fact that stuff like this is still working after nearly fifty years is, to me anyway, testament to the fact that they will still be running in another fifty years and there will be millions of vinyl discs still to play on them!
Please excuse my 'religious' fervour with this brand's turntables from this era, I can't help it I'm afraid and the heart rules the head here with me.
The auto mechanism on these suffers from one major issue - gummed up grease (oh yes, and sometimes a flattened steurerpimpel - crumbling away on later models)! The basic mech is very simple to strip out (mainly the main arm-moving lever, which governs up-down and lateral movement, together with the main cam gear, which is also a doddle to remove). Thing is, removing and degreasing the worst of it would bring back full functionality if re-assembled, but as you rightly say, it's yours to do with as you wish - (you should know how Aspergically upset I get at seeing GL75's being torn asunder for the main drive and platter only, to know what I'm like
)
In the office/workshop system, I'm currently playing with a 1214 I was given in transit damaged form. This thing was in a terrible state and by rights I should have junked it or stripped it out for sale of the parts. I'm a twonk I know, but I couldn't bring myself to do this, so I found a replacement tonearm and rest, bought a cheap 1216 cast heavier platter (not as heavy as the 1019 one though) and stripped down and cleaned all the excess (added) grease off with an aerosol solvent cleaner (I'm a lazy git, but it did the job). Re-fitting was easy for me apart from the non captive balls in this model's horizontal tonearm bearings (the 1019 and 1216 models have better held captive races).
One final tip before I shuffle away is regarding the main drive and motor. I've been informed that humble EP80 gear oil is quite safe for the main bearing spindle/sleeve and captive thrust assembly (pots of Alvania grease are available from mrow2 on VE) and that the motor uses chrome or similar plating on the rotor spindle. Some circlip pliers can be used to carefully prise the two halves of the motor apart and the main place to check is the bottom of the rotor spindle for excessive wear. there's a 'sacrificial' copper disc at the base of the bottom motor bearing apparently, and this can be usefully turned upside down to present a fresh surface if there's too much wear here.
Apologies again for letting the heart rule the head on this deck. I wouldn't have bothered to post if I didn't know how good these basic decks are - for reproducing music from vinyl records - so please look on me with sympathy...