Maybe if you put the pin in and measure to the other end while holding it tight around the drum. if its even possible. You might need about 4 hands.. Compair it to one that didn't stick out.
You can completely assemble one half of the t-20 (input side) and bolt the center plate with out dealing with the other half for trouble shooting.
When you put it back together make sure that you have endplay in the input shaft. If you dont, that means one of those damn washers fell down off of the shoulder inside the drums and got pinched between the outside of the shoulder and the planetary plate as it was reassembled.
That is if you have the type with the washers.