Series 900 spiral balance parts

Question

Hi there, the springs here are 3/8". Laying them side by side you can see a difference in length; the short ones are 28 1/4" and the long ones are 25 1/2". I believe if I buy replacement 28" springs I can adjust where the springs are mounted by 1/2 or 1/4" as necessary to compensate for the difference in length, does that sound plausible? Also a photo of the pivot shoe, it is 3/8" thick, I believe the correct part number is 15-045, is that right?

I am the home owner but have plenty of rehab experience.

Tom · Accepted Answer

Hello! We can definitely help with these parts. Starting with the balance, I recommend triple checking that diameter; your balances current have black tips, which were never used on the Series 900. It's also possible that they're discolored by age, of course, so I could be wrong. Make sure when measuring diameter that you only measure the outer tube, not the spring itself. Your outer tube appears to be missing.

As for length, it should be fine to round up in this case. In a worst case scenario you can always adjust the installation screw placement to make up the difference.

Finally, as for the pivot shoe, I think our 15-212 might be closer. This is 3/8" thick, 15/16" wide, and has a cam opening size of 5/16" x 3/16". Make sure to check that cam opening to verify.