What makes you think “we” refers to Day?
Day, himself, said he used 2-inch tape on that particular lift. What Studebaker used is irrelevant.
No, Day himself did not say that he used two inch tape.... that's an asinine interpretation of what Gary Savage said that Day said......
But.... It's possible that the goofy J C Day did say that they were using 2 inch tape ( even though the use of 2" tape is absurd ) because the moron jotted down that the 6.5 rifle recovered in the TSBD was a quote---" LEVER ACTION"---unquote... and he wrote that the lift of CE 637 was " off underside of gun barrell".