The easiest way to determine the maximum amount of force required to twist on the mirror is to twist on your original mirror, that will let you feel how much force is required. Due to the mount design, the mirror does twist OFF easier than it will twist back ON.
I have designed the adapter to twist on with just a little LESS effort than the original mirror requires. If the adapter seems that it is requiring more effort to twist on than your original mirror, email me and I will replace it with an adapter with the mounting pins set .005" of an inch further apart. This is not a big change, but it does significantly reduce the required twisting effort of the adapter to the mounting button. I have found only a few buttons out of hundreds that are a little oversize and require an adapter with the larger pin spacing.
Please eMail me with any questions that should be addressed
on this page.