hey guys, Just ordered a thumb rest for my jazz bass. for two reasons. I like the old school look of it and I need somewhere between the neck pup and the neck to rest my thumb as i like to finger style there. Wondering if there is a standard placement for it. Will be on the low e side and used as a thumb rest and not on the high g side as a finger rest. is it just whatever is comfortable for me? does it get in the way of slapping at all?