Man, things travel fast on this forum! I've got a couple shots to add and found this was already back on page 4.
Here are a couple more tips.....
When you want to sand/lap two mating surfaces so they fit up
TIGHT (like the handle to guard junction) you don't want to be sanding a whole bunch of extra surface area. Essentially, the larger a surface, the harder it is to get it all
FLAT.
After you cut the front end of a handle block to the angle you want, then you will need to get that area flat. Rather than sanding the whole face (a portion of which will not be part of the knife) we stay at the bandsaw for 45 seconds... Just use the saw to cut in a little "shelf" on either side of where the handle width will be. We don't want to cut right to the lines, leave yourself a little extra.
This ridiculously simple step will make sanding/lapping the face of the block much faster and easier!!!
This next idea is something that I have been thinking about for
YEARS, but just finally took the time to try the other day. If you're going to sand something
FLAT by hand, there is no easier way, IMHO, to do it than with a surface plate and sand paper.
But how do you hold the paper to the granite? There are probably 100 ways... Some of the techniques I have used:
-Apply PSA paper to the granite---it's quick, easy, works well, but can be a royal PITA when you go to take the paper off, and also limits you to the grits you have in PSA paper.
-Put spray glue or feathering disc adhesive on the paper--- works pretty easy, but IME you have to wait for the glue to get tacky before sticking it down, or it will slide around on the granite, it can be a PITA to remove.
-Glue something like 120X down to the granite but don't sand on that paper, you use it to grip the backside of the sheets that you put on top of it. This is easy and works well, but it means that base layer is always on the surface. IDK about you, but I get impatient, and end up sanding with that paper. Pretty soon it won't grip any other paper, and you're back to removing/cleaning/re-applying new abrasive.
So enter something like this doo-hicky I threw together. It took a piece of plywood to go under the granite surface plate, a short section of square tubing bolted to the plywood, an el cheap-O drill press clamp, and a fairly beefy chunk of square stock. It took me about 15 minutes to put this together, and man I wish I had done it a LONG TIME AGO!
Throw the paper on the granite, lay the square stock across the end of it, and clamp down on it with the drill press clamp. It holds the paper nice and tight, and it goes down/comes off SUPER dee-duper
EASY. (I think this tip is worth at least $7!!!

)
In case you hadn't noticed, I use 1-2-3 blocks a lot. I have like 3 sets of them floating around the shop. A sure-fire way to check your handle block for
FLAT, is to press it against one of these blocks and then get some light behind it (of course I do not have light behind it in this shot). Plus, I think this photo also helps to show the benefit of knocking off some of the block face with the bandsaw.