Which device from mature metal?

[cagedog]

I am currently in a MM PT for two years now and was in a JB for a year before. The PT is as easy to keep clean in and as the sales pitch sez, offers less access - I noticed no difference in weight. I have written on the round vs oval issue before. The round offers more gap under the cage which can be more comfortable if the ring and cage diameter are close. But if you have a good vise, you can change a round into an oval and visa versa - MM told me this and I have done it. The oval shape is similar to dropping the ring diameter by about 1/16 inch vs a round.