Thanks for getting back to us, John! I recognize that block piece, now. That's what's known as a Single Hole Aligner. Please see our
26-139 and see if that will replace your own!
Now, for the balances. It sounds like you have our
Series 600 spiral balances. Does that look about right? Please look at our
S600-30 for the 30" tube, an
S600-29 for the 29" tube, and finally the
S600-28 for the 28" tube. I would keep the blue tip option for each one.
The color tips are, indeed, indicative of load capacity. The blue tip for the 30" balance can carry a window sash weight range of 12 through, and including, 31 pounds; the blue tip for the 29" balance can carry 12 through, and including, 31 pounds; and finally the blue tip for the 28" balance can carry 12 through, and including, 31 pounds. Just to give you an idea.
Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
Finally, we do have a charging tool for this type of balance, but it is sold separately. Please see our
75-006 spiral balance charging tool for tilt windows.