Well after thinking long and hard about running without one, i have read many horror stories why you should have one.
Ordered from TPS for delivery tomorrow.
How many times have people removed there sumps in the past? Are the threads pretty stable (unless abused) ?
the most awkward and fragile will be the ones into the alloy section by the bell housing.
you will need a ball ended allen key.
when refitting I would loosly fit the sump (you will need to buy the proper sump sealer and not get too carried away with qty you apply) then fit the awkward ones into the bell housing area with the ball ended allen key.. finger tight.. if they dont go in sweet DO NOT FORCE THEM as the insert threads will be ruined. M7 threads!