My rule of thumb for small quantities of spring sugar syrup (the books say use
1:1  sugar:water) is: fill the jar you're going to use for the syrup, 75 to 80 %
full of sugar. Then run your hot tap til it's hot  and add to the sugar. You'll
have to stop and stir a few times, but eventually, add water til the jar is
full. Make sure the suagar is dissolved before you up-end the  jar, or the
undissolved sugar may settle on the holes and plug them. If you are going to add
Terramycin to the syrup, wait til the syrup cools.
 
This is not the same syrup to add in fall, for winter stores. Then, put 85 to
90% of the jar full of dry sygar, add hot water, etc (it takes more stirring  to
dissolve this mix)
good luck