's caller thermolock: https://www.amazon.com/dp/B00VQXCXXM/?coliid=IBOS08JX082NO&colid=A39NMDHYECA4&psc=1&ref_=list_c_wl_lv_ov_lig_dp_it

Old-fashioned method used pine pitch in the same way, heat it to soften the pitch, press your part in, and when the pitch cools you aint getting that part off without heat