Arabian--are you seeing the platter wobble a little? Usually its not the brass pin (female end) but rather the teflon/delrin end(male end) is worn. I have 3 of the Maplenoll's, the white ariadne reference with the light (ie 40Lb) platter, the grey ariadne signature, and the apollo. I am in the process of completely rebuilding the white one in a fashion that CREM1 did a few years ago.
Please understand, i am not saying the plastic or teflon pin is absolutely the issue, but unless someone modified the air bearing plates, the bottom plate (stationary one) has the pin that the top bearing plate (via the brass insert sleeve) sits upon. As the air slightly lifts the platter, this plastic pin is the actual centering pin that keeps the platter from moving off center. I struggled for quite a while before i learned about the worn pin. The pin can get worn by a previous owner not keeping the brass sleeve lubricated or the platter was slightly off level and the pin got worn as the platter rotated. You can force the pin out by removing the lower platter and using a punch, carefully remove. If you have a machine shop, you can have the take either a round stock of delrin or teflon and carefully turning it down until it just fits the top sleeve. Hope this helps
Please understand, i am not saying the plastic or teflon pin is absolutely the issue, but unless someone modified the air bearing plates, the bottom plate (stationary one) has the pin that the top bearing plate (via the brass insert sleeve) sits upon. As the air slightly lifts the platter, this plastic pin is the actual centering pin that keeps the platter from moving off center. I struggled for quite a while before i learned about the worn pin. The pin can get worn by a previous owner not keeping the brass sleeve lubricated or the platter was slightly off level and the pin got worn as the platter rotated. You can force the pin out by removing the lower platter and using a punch, carefully remove. If you have a machine shop, you can have the take either a round stock of delrin or teflon and carefully turning it down until it just fits the top sleeve. Hope this helps