Chain installed. Clutch flipped to off position when installing wheel as normal. Arm still jammed. Clutch on or off makes no difference. Seems to be issue of the cassette diameter due to the huge lowest gears. But I can't be there only person to have encountered this when retrofitting on old frame for 1x10 with a huge low gear. It appears that the goat link, which replaces the b pivot is longer than the b pivot link, which would shove the shifter rearward and possibly solve the problem, but I have not read that this is an advertised benefit of the goat link.