DrGregC wrote:A part that is always in great demand - either original or reproduction - is the nickel-plated brass, turntable trim ring found on many Columbia models. It has been the subject of several previous threads. In 2012 I wrote:
My favorite subject... I have an otherwise perfect and original Columbia BD that is missing the trim ring. I scan eBay every day looking for one. I have gone to clock shops, but the clock bezels will not work. The platter on the BD is oversize, measuring 12 ⅜" diameter. I have approached the skilled craftsmen in our hobby including Ron Sitko about making reproductions. It would be possible to make both the 10" and 12" versions of the often-missing Columbia trim rings, but the start-up costs for production would be prohibitive unless we could place a large order.
I'm not sure that this is a part amenable to CNC techniques, but, along with many others, I would love to find one!
The rings would be made as metal spinnings. You could try talking with someone at Precision Metal Spinning in Fenton, MI. I'm sure they can do it but, as you suggested, there would be a start-up cost to produce the proper tooling. My Columbia BJ has a ring made of cast aluminum. It is original.