Too funny that no source is given on these experiments to prove what he says.
Unlike all the other things he says which have thorough references ;-) Maybe he was 'borrowing' the measurement of the soul's mass reported by Dr. MacDougall and doubling it (42 grams is 1.48 ounces).
How can a thetan be crippled and dismembered,
if he/she is without a body?
I guess they could be virtually crippled by doing things to them like the things purportedly done to the BT's in Incident 2.