OK Been through the ringer on this. I seem to change boats every few years and will only use a Terrova. My big CC and last Bass Cat current Ranger. I busted out the saws all cut the bolts off old motor used large stainless wood screws and siliconed the new unit on (30 min). I know it's not for everybody but I'm a carpenter and it s not going anywhere. If its getting loose I will know. The garage door opener your standing under has less holding it up. A bad back and tired of no access. Only do it if your confident in what your doing.
Promise one week on Rayburn of tournament fishing, it'll be ripped out. If I do not have access, I will cut an access hole. Under the pedal on a basscat. Make sure to use at least 6 bolts with fender washers or use an aluminum backing plate. Make sure you counter sink the gel coat. And put something rubber between the trollingmotor and glass. Also while you're at it, add an additional Velcro strap.
P.S. Rub the threads on the stainless bolt threw a bar of soap. This will keep them from locking up as easily.