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Unfortunately, reassembling the pressure bar with the Ultra high-speed angular contact ball bearings inside the guide bushing on a 345 can be a tricky and fiddly process without a specific tool or technique. If the ball bearings are magnetic, use a strong magnet to carefully guide them one by one into the sleeve through the opening in the guide bushing. Be patient and precise with your movements.

If the motor uses a magnetic system, consider a pre-made pulley and bearing reducer kit. These are available online from various sewing machine parts suppliers or even general hardware stores. Look for kits compatible with the motor shaft size and desired reduction ratio. While you cannot fabricate a steel mount, a wooden one might be feasible. However, ensure it's sturdy enough to handle the motor's vibrations and weight without affecting sewing performance.

Instead of trying to measure directly into the hot container, pre-measure each batch of ingredients (5g beeswax, 25g cocoa butter, 50g oil) and store them in separate containers. This way, you can quickly add them to the melting pot without getting burned or needing to handle the hot container. Once melted, you can use a ladle or a heat-resistant syringe to transfer the balm to your containers. This provides more control and avoids spilling hot liquid.