I'm all for building on a budget but this is were keniff and I disagree. I usually do a cost-benefit analysis of whatever I'm buying(or not buying). If I can buy an 18 dollar adapter to keep from having to drill and tap somethin then I do it. Adapters are on pg 94 of S&Ps catalog. Just thought I'd give you two ideas to choose from.

As for your original question....I'm not sure.