installing the SME V tonearm in the Technics SP10

the standard 9" SME 309, IV and IV are a very tight fit on the SP10 mkII. The bass ends up being tight up against the tables plinth, and forward in a way that looks akward. Take a lool at some that are mounted and you will see what I mean. Thats because the sp10 platter is oversized, pushing everything wide. It will work, but just. I ended up going to a VPI JMW 10.5 which also barely fits.

Remember...the V has no adjustment for azimuth, so when mounting it on the table, make certain it is absolutely square.

Manitunc et al, I believe it is the square escutcheon that surrounds the platter and is part of the chassis that will get in the way, not the platter. The square also makes mounting of many tonearms with side pillars to adjust VTA difficult, awkward, or impossible. These include Triplanar, Talea, Reed, etc. That escutcheon is the best reason I know of to remove the motor from the chassis and mount it directly into a plinth.

Platter is not really over-size. It's pretty standard.

Stringreen makes a good point. Start with making sure the platter is level and the armboard is level. If both of these surfaces are level, or parallel to each other, then, assuming you can get the arm to fit, the headshell, which is what is critical here, should be also parallel or level to the platter and arm board.

Now, without azimuth adjustment, the cartridge build quality (cantilever orientation) becomes critical. If you have the optional SME V removable headshell, it can be slightly rotated to adjust for azimuth.

Lew is correct about the square escutcheon creating the problem, not the platter dimension. I also have a JMW 10.5 arm which would have been difficult to mount because of its off-set mounting base. Unless you swing the spindle to pivot distance template way around to near a 3:00 position for the arm, the square interferes with that mounting base.

Apparently Technics intended only 10 or 12" arms to be installed with this table. And since Tubeperson has the Obsidian plinth, he will be limited to those arms where the mounting template arc falls within the dedicated armboard position.