I was thinking about adding .5oz to my Pechauer Pro cue. The seller sent me some short weight bolts with the cue. They look to be the correct size but are hex head not color coded flat head like the images I see for Pechauer bolts. They appear to be the size of a Pechauer .7 oz. I have a few questions that maybe someone could help with. One is can I simply screw in the short bolt, provided it fits, on top of any bolt that may be in there? Or is it best to see if there is a bolt, unscrew it, weigh it and get a heavier bolt? Next, should they be lubricated at all, and if so with what, I don't want to deteriorate the wood. The bumper cap is sort of flanged out and only presses in, but I am having a hard time getting it flush again. I haven't put a bolt in yet. Can I put a little lube on it to press it in fully? I've been playing with 19.5oz McDermott cues and this one is 19oz and feels a little light. I suppose that I could adapt because it will be my main player, but that still leaves the question of lube for the bumper cap. Thanks