ORIGINAL: chemie
Thanks for the suggestions. Maybe I will skip the tap as this is plastic mount.
Should I drill and put a lock-bolt on the end (the bottom is flat) or sheet metal screws #8 size for ST090?
I have had sheet metal screws break in mounting engines. I recommend you use metal machine bolt and tap the mount. It will neither break nor come loose. I also use a lock washer between the bolt head and the engine flang. Tapping the mount is not hard to do.
Bruce