Hello Duncan,
delighted to have you back!!
Getting the bits to retrofit the machine is physically possible, but considering that the retrofit act would resemble more a component recycling process than anything else (due to the physical build of the machine – think: at some point you would have a bowl full of bearing balls in front of you), we are not ready to support it to the extent that users should do it on their own. We are evaluating other possibilities however.
Please stay tuned, and please stay with us this time, will you..
Cheers,
Gabriel