First don't cut the pipe, you can lower the head all the way down to the base. Second, consider a longer bit, they do come as long as 12" but that may be too long. If you decide to plug the block drill every other hole, plug those then plug the second half, this will prevent overlapping one hole into another until one is plugged. Don't hurry this job, use epoxy to secure the plugs, level the first set of plugs then the second set of plugs. You can cut plugs from new pinblock stock or get the dalignit plugs from Webb Philips. The high spiral longer bits can be purchased from him or from Geneva Imports or do a search for longer bits on the nets. Newton
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