[bmcnicho]

I was surprised, but the B50 & B58 blocks (Amateur Competition) do have provisions for the spider, but the M&N351 (Professional Competition) do not (go figure). I didn't realize it until the short block was assembled. We had to grind down some raised lettering in the lifter valley and hand drill holes to accept the screws for the spider. The holes still aren't tapped since our tap & dye kit tapers down, so at the current depth of the hole the tool bottoms out in the hole before it removes material for the threads. I am a bit scared to just drill deeper because I don't want to end up making a through hole in the block. I am considering grinding down the tapered end of the tap & dye so it is more square and will remove material for the threads sooner.