I have seen this topic come up before. I am going to post a bunch of photos so if they don't come up either give them more time or hit "refresh". (There should be 7 photos.)
Last week I had a flat tire and when I changed the tire I noticed several spokes could be moved by hand. The wheel wasn't loose enough to start clacking, but it was looser than I want to use.
Today I dropped by the hardware store and purchased some washers and spent a half hour tightening up the wheel.
Tools you may need:
I thought I might post how I do this job. The last time I did this job was on my old 1929 Buick. I used electrical box reducers for shims. It turns out that they are too large diameter for a model T. The best I could do was a 5/8" washer. Instead of having the thin ones in a bin they are now packaged in pairs for $0.79!
Ok, you already see where I'm going as the last picture shows the modified washer:
I used an angle grinder to cut the washer.
Next place your spoke jack and crank it:
You need to open up a space for the shim:
Place the shim and tap it home with your hammer and screwdriver:
When you have done this move around the wheel 180° and do it again. Today I placed a shim on both spokes neighboring my jack and then turned 60°, then did it again so I ended up with 6 shims and a still round wheel.
I have discovered you do not need to remove the demountable rim. Years ago I did this on my 1913 T which had wooden felloes, it works just fine.
This type of spoke jack tends to crush the spokes a bit at the hub. You can grind the jack to fit the spokes better or lay a thick piece of leather over the jack. No matter if you have nicely painted or varnished wheels a touch-up will be needed. As you can see on my wheels esthetics is not a huge priority, I want nice tight and strong wheels to abuse!
TH
Next time try a piece of cow hide between you jack and the hub, it'll keep from crushing the wood. But you know, if my spokes needed that much of a spacer, I think I would replace them instead.
Shimming is fine for a few thousandths or so (.030 max about the thickness of a dime) anything greater than that should be replaced. I've found that putting a cross-hatch pattern on the wood side helps keep them from sliding too.