The cheapest option is a bike cover
Fastening something down that's been designed by the manufacturers may invalidate the warranty may affect insurance
Cover it up
Thieving bastards
it boils my piss you work hard to buy a new bike and scum come and just take what ever they want
Need more vigalanties
More broken fingers and legs with pick axe handles
A true

story a bloke near me built custom trikes and choppers
He had two Harley engines stolen from his shop
He found out who stole them
Told him to bring them back and he would let him off
When the thief brought them back
The owner said he lied to get his engines back
And crushed both the thiefs hands in his big engineers vice
NOW THATS JUSTICE
Guess what the bike builder hasn't had anybody break in since
Boy did I laugh