Bit late now but there is no need to cut the shroud. As Simon says, the motor is very powerful, the first time I tested one I nailed the motor to a large piece of 2” x 8” to stop it jumping around - now I have Toaf I can regulate the output. Something is wrong somewhere, check that the brushes are moving freely, clean the commutator and score the segments with a craft knife, check the armature moves easily before and after replacing the lid.
Good luck
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