No - you will not have a balance issue.
The center support bearing and mount is not a bad job, my son and I did it (along with info from the old GTV 6 site and this forum), and it went fine. We also replaced the front giubo at the time. I didn't even have a hydraulic press in my garage, only hand tools, pullers and a big vise. Just watch your disassembly and reassemble in reverse. Now is the time to do it!Thanks. I got the flex disc kit from Centerline (front, center, and rear). It also comes with a center support and bearing.
I've been through the shop manual a few times and can/t find a group/section that covers the procedure for the driveshaft center support and bearing,. From the forum, I know I need a 32mm deep well (perhaps with the outer diameter turned down) and some kind of puller/press, but where in the manual does the procedure appear? Group 15 has three pages total: 15-1 is the cover sheet, 15-2 is grease/torque specs for for the discs and center bearing nuts, and 15-3 is the special tools table. But there are no diagrams or instructions.
I'm wondering if I even need to take this on. The rubber in the support looks fine. I'm thinking I'll put in the discs and leave the bearing alone for now.
Ouch! The old Vitaloni cracked mirror base issue. I did successfully use JB Weld to repair one like that, and then I fitted a bit smaller spring, and was very careful when I put it all back together and tightened up the big hex nut. It's fine, still on the car. It just needs enough spring tension not to fold in at 100 mph!