Hello. Since im using pretty old microscope for most of the work, distance between the lens and the board has to be pretty small, so most of the time i keep the board on the table (on heat resistant mat) while i solder it. There are one main issue with that - heat resistant mat "puffs" up when heat is applied - it makes a bladder where i solder, so my board lifts up and gets out of the focus. I hope to solve this problem with a board holder. So far, i know people like omnivice, but its too big for me to use, since i wont have space to solder (space between the board and microscope lens). I might upgrade microscope soon, but still want to ask, what is your favorote board holders ? Also, interested in preheaters, since its a bad practice to do some works without that

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