Futaba servo availability

[MMIX2009]

It seems that the Futaba servo used in the project (RS303MR or RS204MD) are out-of-stock  at Futaba USA, and I can't find them anywhere else. https://futabausa.com/product-category/servos/robot-servos/

Would you consider redesigning the hub so that it fits more commonly available servos?

[KoshiroRobot]

It's unfortunate that the RS304MD is currently in low stock. However, you might be lucky as it seems to be available on Amazon Japan, although there are only four units left in stock:
RS304MD on Amazon Japan

Please note that purchasing from Amazon Japan can be challenging for international customers due to language barriers, the need for a separate Amazon Japan account, and potential international shipping and customs fees.

As an alternative, the RS303MR is available here. It is likely the most compatible option, though it is a bit pricey:
RS303MR on Vstone

Another possible substitute is the RS318CD. It has the same dimensions and supports TTL half-duplex communication (though not PWM), so it might work with the same program. However, it is a daisy-chain servo, which means its rear shape differs slightly from the RS304MD, potentially causing wiring issues. Additionally, its operating voltage is 6-8.4V, so an external power supply might be necessary:
RS318CD on RT Shop

The RS305CR and RS302CD also share the same dimensions but use different communication methods from the RS304MD. Therefore, you might need to modify the program and wiring. These servos might also require an external power supply:
RS305CR on Vstone

Purchasing from these Japanese sites may also involve similar challenges related to language, shipping, and payment methods. If direct international shipping is not available, you might consider using a forwarding service like Tenso or Buyee to facilitate the purchase.

Unfortunately, I do not plan to redesign the hub to fit more commonly available servos in the coming months. However, I will consider this for future robot projects.

[MMIX2009]

@KoshiroRobot thank you for your prompt response.
I'll look into the other sourcing options you provided.