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Thanks both for your speedy input. I'm currently working away from home... covid trapped in another state, so don't have access to many tools at all, but I think I will try a mild acid bath and then electro zap the beast when I'm back home... in the meantime I've done a fair bit of wire brushing and found plenty of fine steel underneath. BUT... Some tapping to release components and I've learnt my first major lesson... checking what the next link is in the sequence... In tapping a lower link arm in the main body of the machine, I've stressed and cracked another linking piece at the top of the associated rod. Watch this space... I'll find the part number and start my hunt... I'll attach an image of the good, and the bad, below. Let me know if you know this link arm part- it looks replaceable- with two accessible bolts... but its a matter of wether I can locate the part. Now I'm going to slow down...

Hi, I'm a new member, and have acquired a cheap and neglected Singer 45K93 (circa 1964). The odd screw comes out after drowning in WD40 and a WD 40 penetrant, so I believe it is still alive and metal intact, and with rescue. I love that it is still threaded. I have restored around 30 old domestic Singers (Covid obsession) but haven't yet encountered this much work. I would like any advice on rust removal... prior to hopeful 'release' and a possible need to fully strip down- but I'd like to get it 'moving' before deconstruction so I can learn more about its various actions first. I am thinking at this stage after research that the best cheaper and safe? option (given that I need to submerge the whole thing to get to the inner rusted components) is to submerge the whole machine in a bath of oxalic acid. I'd appreciate any advice! i.e. will oxalic acid strip paint? (not that it matters too much). BTW Evapo Rust is very expensive here in Aus.