veneerman":3lc23z1d said:
Do the bases bow a lot. And if so are they easy to flatten. Wouldn't of thought they would to be fair.
They can be out-of-flat straight from the factory, or can subsequently distort due to internal stresses in the casting (this is seen less commonly in older planes because the foundries had a much longer rest period for the rough castings before machining was commenced). And as already covered above they are subject to wear; a slight hollowness along the length isn't that uncommon to find in a well-used plane.
However if you buy a lightly used plane – and there are many out there! – you should check how it works first before checking the sole for flatness and then attempting to do anything to it. Many planes don't have perfectly flat soles but function as they should, and making them flatter and smoother can actually
negatively affect their performance. As a practical example, if you buy a 5 and intend to set it up and use it as a traditional jack the sole only needs to be flat-ish for the plane to work correctly, i.e. if you sight along the sole and it looks flat that'll do.
There's
tons of good information on all aspects of this here in the archives. In terms of brands you can look you can cast a much wider net than just Record and Stanley, greatly increasing the pool of tools you might buy from on Gumtree, Facebook's marketplace, at car boots and (IMO as a last resort) eBay. Here's a thread where I asked the very question, what's worth looking out for and what's not in British-made metal planes:
vintage-british-planes-worth-buying-t94472.html
Further to what I say above about how long restoration/refurbishment might take, buying right is the important first step. Then if you use the right techniques, barring anything unforeseen a bench plane can be brought back to usable condition in under an hour, and possibly in 20 minutes or so if you have your techniques down pat. This is 20-60 minutes of actual hands-on work, the total process (including wait times for finish the dry, any rust soaks to do their thing) might be a couple of days. I put at least three coats of finish on my handles and frequently more, so finishing time can stretch to a week + in my case, but it's still no more than 10 minutes or so of actual work after the scraping/sanding to prep the wood.