Needed a holder for common chlorine tablet to clean stains at the bottom of the swimming pool. Although similar ones are available for purchase, I did not like the design or the cost.

This design uses carriage bolts and wing nuts. The square under the head of the carriage bolts stop the clamping bolts from turning while the wing nots are being turned to clamp the chlorine tablet in the holder.
While carriage bolts are preferred, regular round head or hex head screws/bolts will also work.

For assembly the needed hardware is:
Stainless steel is recommended.
3 - 2 1/4 inch long (or longer) bolts, 1/4 inch or 6mm diameter
1 - 3 inch long bolt, 1/4 inch or 6mm diameter
4 - 1/4 inch or 6mm wingnuts (hex nuts will work but will require the use of a wrench/spanner and may break the plastic if over tightened)
1 - 2 pin retainer used to hold pool cleaning tools in a pool pole

SeeMeCNC

Rostock Max v3.2

No

No

.2

50%

Printed with 5 perimeters for strength.
Use stainless steel hardware.