https://www.reddit.com/r/typewriters/comments/1ixht52/how_can_i_make_a_typewriter_eraser_like_this_have/

Back in the day people used custom erasers for erasing. They were much harder than the softer erasers in use now, which is why modern pencil and art erasers don't work as well. For some historical methods, see these videos or here.

Secretaries also used small eraser shields to target individual letters, words, or lines. They also used larger curved shields for erasing within carbon copy packs.

Eaton used to make Ko-rec-type tabs which could be inserted for short corrections and it can still be found online as old stock.

There was also bichrome ribbon with white correction tape, but that tends to fleck off and make a mess in your machine over time. Similarly White Out is still made, but it can spill and make a mess while you wait for it to dry.

For modern typists, hand-held correction tape is probably the quickest and easiest.

This could be expanded for the widest range of history on erasing using typewriters with caveats, etc.

reply to u/Fearless_Camera_1788 at https://old.reddit.com/r/typewriters/comments/1ixmz88/how_to_erase/