I will be the first to try my fix..... I have an original guide that the plastic fell off of. I roughed up the aluminum with a dremel, then a knife (cross hatch), then cleaned it. Roughed up the plastic the same way. Jb welded the two back together and used some small clamps and electrical tape till the JB set up. So far, it seems like it is back together very well, I have tried my darndest to get it to come apart. Needs a real world run test now..
FWIW, the guide was still together when I pulled it, but a quick pick with the ole finger nail and off the plastic came...seems like a shame to get rid of the original because of a poor bonding agent.