CAP Adjustable Dumbbell Spacer Ring

The spacer ring on these dumbbells are made of plastic and in less than 2 years one of them broke.  I used FreeCad to design it with a caliper.   I used an Ender 3 V3 SE to print it using standard settings with 100% infill, 80% flow and PETG.  

After printing, the dimensions should be:
Outer diameter 45mm
Inner diameter 20mm
Thickness 2.5mm 

If the printed measures do not match the design then change the flow rate.

I bought an Egofine 46 Pieces 1/4 inch Drive Socket Ratchet Wrench Set at amazon to remove the hex nut on the top.  It needs a H6 bit and the handle on this set gives me leverage to remove the nut that is very tight.

The hardest part is removing the nut everything else is pretty straight forward. Just make sure that  when putting it back together, the internal discs inside and in the right position matching the other side of the Dumbbell that is not broken.

Here are the steps:
[End Cap] ──> [Lock Nut] ──> [Outer Weight Selector Dial] ──>[Discs] ──> [Broken Spacer Ring]
1.  Put the weight in a vertical position
2. Remove the plastic end cap
3. Apply some WD-40 around the nut and wait an hour
4. Use an 6mm H6 hex wrench to remove the nut (anti clockwise)
5. Remove the 3 screws underneath the metal plate
6. Remove the two long screws on top of the metal plate holding the CAP logo.
7. Remove the top cover with the inner weights
8. Remove the lock ring
9. Remove the metal plate and all the discs
10.  Install the space ring and do everything in reversal