I just installed spinlock adapters on my 2001 Boxeter, to help secure my new hardtop.
The top had to go down and up several times, hardest part was removing and reinstalling the carpeted side trim pieces (carefully without breaking anything), which after being removed and with the top almost all the way up, gave very good access to the spinlock adapter's retaining bolts.
I found the "baggie trick" not only unnecessary, but more trouble than it's worth, since the bag material gets in the way of the bolt, and too easily pinched. I had good results just being careful with a long-handled Allen wrench to get the bolt started. I then had good results using a 3/8" drive torque wrench, extension, and 5mm allen bit to get the specified 16-2/3 ft-lbs torque. Decided to use anti-seize, too.
I didn't end up getting so much as a scratch on my arm like rfuerst911sc, so not sure what that's about?
This "how to" shows good detail how the carpeted side pieces are held in place:
https://www.renntech.org/forums/tutorials/article/110-preparing-a-boxster-for-a-hardtop/