Miscellaneous ramblings...
The Perry is a licensed copy of the F&S Torpedo, German, dating way way back. The same design is still sold new today as the "Velosteel".
I have collected various other copies of the Torpedo made in other European countries but they are all of lower quality than the Perry.
Unlike most other hubs, which are meant to come apart from the driver side, these are meant to come apart from the brake side. The first challenge is nobody has a proper tool to loosen that "notched ring" they use for a locknut. I use channel lock pliers but they do scar the part.
The adjusting cone is meant to remain stationary on the axle, but about half the time they will come coose if you can't get the brake side loose. There are no flats on it to accomodate a wrench.
I do NOT dissassemble the driver. I do NOT attempt to remove the dustcovers that retain the bearings on the brake side of the hub or cog side of the driver. It is too hard and too risky for most casual mechanics, and not really necessary. I soak and scrub the assemblies for a good long time untill I am satisfied that all the resultant access-impaired cavities are cleaned out. I then visually inspect the bearings and visible races for damage.
If something is going to be damaged, it will usually be the adjusting cone and accompanying bearings. Most times it is rust and not wear.
I squish grease into all those access-impaired cavities with my fingers and reassemble.
The adjustment process is quirky and hard for even me to warm up to. Instead of adjusting the adjusting cone and then locking it down (as with all others)... you leave the lock nut on the LEFT side loose, turn the adjusting cone BY TURNING THE AXLE using its square end, then lock down the left side.
The axle uses standard threads, so you could replace the lock nut (ring) with a hex head if desired. I have not stooped that low as of yet.
I have seen 2 types of brake shoes. The single piece brass cylinder (earlier) has worked less well for me. The 2 piece segmented black assembly has worked better for me.
Some people claim the Velosteels work better with oil instead of grease... but I have never had any problem with grease in my Perrys.