I just replaced the springs on my Interceptor and seeing as it has less than 400 miles on it figured the stock fluid will suffice until it's time to change it this winter. But being that there are no drain plugs and here in PA the inspection mechanics love to stick the inspection sticker on the fork tube up between the triples....pulling the forks to drain the oil becomes a bit of a problem.
So I just ordered a used fork from Ebay to disassemble, measure then drill and tap a drain hole so I can then do the same safely on the bike. Fork maintenance is important but with the hassle of disassembly it gets overlooked by many owners for far too long. And if you are one that likes to tinker with the suspension tuning by changing fork oil viscosity it will be much easier with a drain plug.
Some have opined that just changing the fluid doesn't get out all the dirt like upending the strut will....but unless you flush with kerosene just upending and draining doesn't get all the dirt out either. I just serviced the forks on my SV1K and the kerosene flush was nasty looking! I'm planning to do the same with the Interceptor....pull plug, drain and pump until empty, add 3-4 oz kerosene, pump and drain until it comes out looking clean...then fill with the 'fluid de jour'.
Once I get a good measurement of the plug location I'll start another post with the info for the collective data trove.