here is the new spider rig setup..finally got the right knobs and it works great..here are the specs for hardware i got from FASTENAL:
Knobs: Part # 11106464
2" set screws for rod holders part # 73284
1 1/2" set screws for base and t-bar part # 73282
Only problem I had was screwing to the base..I put some Loctite thread sealer on so knob is sealed to threads and it works great. The knobs on rod holders and t-bar DO NOT need Loctite as they fasten down tight.. Hope this helps.
splitshot LIKED above post