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I am stuck on clues 19 and 33; also cannot which letters to alter.

The usual format on here is to give the clues, number of letters in the answer, any letters you have, and someone should be able to help you.

Thanks for the advice, Rusty. The puzzle is radial with 48 clues, all with 6 letter answers.
19 is: Teak-like tree to plant NW to SE in units; and letters are t??las. The positioning of the answer is in the NW/SE part of the grid, which may be relevant.
33 is: Reinforcements involving new Scotch tape; and letters are t??rts but in this clue the wordplay leads to the answer with an extra letter not entered in the grid; in this case the letter is, I think, S.

Escuan, I fear the puzzle is way out of my comfort zone, but a tesla is a unit of density. Teslas?

Thank you, Rusty. Teslas it is; reversed it reads Sal (a teak-like tree) + set (to plant). And the NW/SE positioning was critical.

33a strunt(s)