Blood donation today

17 so far in the last 5 years, missed a bunch because of high blood pressure, low iron. I'm O negative, universal donor so I'm quite popular there. I can only receive other O- blood, but luckily one of my friends has that, already told her I'm calling her if I get in an accident that needs blood.  Didn't realize all the requirements which make it impossible to use my affected left arm as the donation site.

1. Arm must be able to lay completely flat.
2. Arm must stay on table.
3. Arm must not spastically contract for any reason.
4. Must be able to squeeze rubber ball every 4 seconds. 

The major problem with using my good right arm for donation is the cotton swab and tape on the puncture site. The stretchy red elastic is usually wrapped at least 2-3 times around my arm. No tab is left free and I can't reach the tape with my teeth. My left fingers have zero ability to pick up anything and I can't even get the hand anywhere close. So I have to wedge a long knife in a kitchen drawer and saw the red elastic thru, hopefully without cutting myself.