Mounting stuff to the skin of my bird

[James]

I have a '85FC31' and need to mount a longer entry way grab bar for my
four year old son to hang onto when he enters my bird. I have a 24"
stainless steel grab bar that will cover the top hole of the existing
handle and stop just above the generator door.

Can anyone make any recommendations for the best way to mount this
without causing problems (i.e.: length and size of screws, size of
associated drill bit, gasket or caulk, etc.)?

Thanks in advance for any and all advice.

Sincerely,
JR Torrico

'85FC31' "The Short Bus"
N Fort Myers, FL